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Mechanics- velocity and acceleration

Its question 1116062217406263768208377306079461.jpg16062217909486111387988675387159.jpg
(edited 3 years ago)

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Reply 1
Original post by Shas72
Its question 1116062217406263768208377306079461.jpg16062217909486111387988675387159.jpg

What does that diagram show?
Reply 2
it shows decelerating
Reply 3
Original post by Shas72
it shows decelerating

Is that what you understand is happening to the velocity, as described in the question?
Reply 4
the block is lifted from ground at a constant speed till 5s. after 5s it slips and decelerates at 10m/s^2 and reaches a height of 6m which means the total area under the graph is 6m
Reply 5
Original post by Shas72
the block is lifted from ground at a constant speed till 5s. after 5s it slips and decelerates at 10m/s^2 and reaches a height of 6m which means the total area under the graph is 6m

That's what the question says, does your graph show that?
Reply 6
Original post by mqb2766
That's what the question says, does your graph show that?

16062235305886815727657351250066.jpg
Reply 7
Original post by Shas72
16062235305886815727657351250066.jpg

Have a think for maybe 10 minutes and explicitly match the different sections to the question. There are a few important mistakes even though the graph is relatively simple. The more you can do yourself, the better you'll understand/remember. If you have a specific question about what something means, post that.
Reply 8
Original post by mqb2766
Have a think for maybe 10 minutes and explicitly match the different sections to the question. There are a few important mistakes even though the graph is relatively simple. The more you can do yourself, the better you'll understand/remember. If you have a specific question about what something means, post

Can you pls tell me if my second graph is right?
Reply 9
There are a few important mistakes even though the graph is relatively simple
Reply 10
Original post by mqb2766
There are a few important mistakes even though the graph is relatively simple

Ok thanks! Let me try
Reply 11
Original post by mqb2766
There are a few important mistakes even though the graph is relatively simple


Can you pls sketch the graph if its not inconvenient or can you pls give me a hint on how to solve this question. I have tried to do in diff ways of using a = v-u/t
Reply 12
Original post by mqb2766
Have a think for maybe 10 minutes and explicitly match the different sections to the question. There are a few important mistakes even though the graph is relatively simple. The more you can do yourself, the better you'll understand/remember. If you have a specific question about what something means, post that.

Also if its ground level u is 0. So when I do a = v-u/t, I get -50
Reply 13
Original post by mqb2766
There are a few important mistakes even though the graph is relatively simple

Thanks! I got the ans. I came to know where I was doing mistakes
Reply 14
Original post by mqb2766
There are a few important mistakes even though the graph is relatively simple

And it was very very simple. I was unnecessarily complicating it
Reply 15
Original post by mqb2766
Have a think for maybe 10 minutes and explicitly match the different sections to the question. There are a few important mistakes even though the graph is relatively simple. The more you can do yourself, the better you'll understand/remember. If you have a specific question about what something means, post th

Attachment not found
I got the ans but without the graph and mainly using the displacement and not the concept of area under the graph. I still don't get the ans with the graph. Can you pls guide
(edited 3 years ago)
Reply 16
Original post by mqb2766
Have a think for maybe 10 minutes and explicitly match the different sections to the question. There are a few important mistakes even though the graph is relatively simple. The more you can do yourself, the better you'll understand/remember. If you have a specific question about what something means, post that.


1606479342844689384809520017497.jpg I got the ans using displacement and not the area under the graph. Can you pls tell me where am I going wrong in the graph part
Original post by Shas72
1606479342844689384809520017497.jpg I got the ans using displacement and not the area under the graph. Can you pls tell me where am I going wrong in the graph part

Sure, can you upload your current attempt at the velocity-time graph? Maybe (briefly) mark on each section why you think it's that shape. I don't care whether the graph is right. I do care whether you try to explain your thinking behind the graph.
Reply 18
Original post by mqb2766
Sure, can you upload your current attempt at the velocity-time graph? Maybe (briefly) mark on each section why you think it's that shape. I don't care whether the graph is right. I do care whether you try to explain your thinking behind the graph.


16064811219171396311277115100961.jpg
Original post by Shas72
16064811219171396311277115100961.jpg

Your constant speed label is correct, but what does your graph section show?
What is the speed when t=1,2,3,4,5? Is it constant?

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