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# Vectors Velocity Accelaration and Displacement HELP!! Watch

1. Hi Every1

Got question on vectors which i cant handle, can some please show me how to go through this, thankyou!

A body has initial velocity u ms-1 and accelerates uniformly at a ms-2 for t
seconds, reaching a velocity of v ms-1.
The relationship between these measures is:
v = u + at.
Its displacement, s metres, over this period is given by:
s = ut + 0.5at^2

1. A body is initially at rest and accelerates for 8 secs at

5
-1 ms-2
2
a) what is its final velocity and b) what is its displacement

I've worked out the final velocity to be

40
-8
16

How do you work out displacement??
2. (Original post by Student21)
Hi Every1

Got question on vectors which i cant handle, can some please show me how to go through this, thankyou!

A body has initial velocity u ms-1 and accelerates uniformly at a ms-2 for t
seconds, reaching a velocity of v ms-1.
The relationship between these measures is:
v = u + at.
Its displacement, s metres, over this period is given by:
s = ut + 0.5at^2

1. A body is initially at rest and accelerates for 8 secs at

5
-1 ms-2
2
a) what is its final velocity and b) what is its displacement

I've worked out the final velocity to be

40
-8
16

How do you work out displacement??
What is the -8 and 16 for?
3. (Original post by Student21)
Hi Every1

Got question on vectors which i cant handle, can some please show me how to go through this, thankyou!

A body has initial velocity u ms-1 and accelerates uniformly at a ms-2 for t
seconds, reaching a velocity of v ms-1.
The relationship between these measures is:
v = u + at.
Its displacement, s metres, over this period is given by:
s = ut + 0.5at^2

1. A body is initially at rest and accelerates for 8 secs at

5
-1 ms-2
2
a) what is its final velocity and b) what is its displacement

I've worked out the final velocity to be

40
-8
16

How do you work out displacement??
The final velocity is , why have you written -8 and 16 after it?

For displacement use the formula, , we know the acceleration, time and initial velocity so displacement can be worked out.
4. (Original post by raheem94)
The final velocity is , why have you written -8 and 16 after it?

For displacement use the formula, , we know the acceleration, time and initial velocity so displacement can be worked out.
The question had a column vector so my answer was also a column vector. I just did not know how to put the big brackets into a html page. I've checked my answer and it is right and includes the -8 and 16. What i cannot work out is the displacement in column vector form.

Edit ive added a pic of the question sheet
Attached Images

5. (Original post by Student21)
The question had a column vector so my answer was also a column vector. I just did not know how to put the big brackets into a html page. I've checked my answer and it is right and includes the -8 and 16. What i cannot work out is the displacement in column vector form.

Edit ive added a pic of the question sheet
Try to work out the displacement in the same way, first use, a=-5, then a=-1, then a=2.

For the first row, input, a=5, t=8, in

Find the displacement, use a similar method to find the other 2 rows.
6. (Original post by Student21)
The question had a column vector so my answer was also a column vector. I just did not know how to put the big brackets into a html page. I've checked my answer and it is right and includes the -8 and 16. What i cannot work out is the displacement in column vector form.

Edit ive added a pic of the question sheet
Is the answer to this displacement part,
7. (Original post by raheem94)
Try to work out the displacement in the same way, first use, a=-5, then a=-1, then a=2.

For the first row, input, a=5, t=8, in

Find the displacement, use a similar method to find the other 2 rows.
I just found out the answers on the answer sheet are not even correct. I was getting the right answers all along. Thanks for the help anyways, it was much appreciated.

Yes the answer you got is the correct one.

Updated: May 10, 2012
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