# mechanics help please urgentt

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Thread starter 2 years ago
#1

I dont understand the second part to iii) can somebody help please will be so much appreciated
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Thread starter 2 years ago
#2
....
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2 years ago
#3
The parts are travelling horizontally, maybe at different speeds, but they are travelling horizontally, not vertically. They both start at the same vertical point, so assuming in this model that the vertical change is nothing, they both remain at the same height.
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Thread starter 2 years ago
#4
(Original post by BlueHighlighter)
The parts are travelling horizontally, maybe at different speeds, but they are travelling horizontally, not vertically. They both start at the same vertical point, so assuming in this model that the vertical change is nothing, they both remain at the same height.
I get that but don't understand the bit just after it - the hence bit can you help me there please?
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2 years ago
#5
s=ut+1/2at^2 and substitute the values in
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Thread starter 2 years ago
#6
(Original post by Razz13)
s=ut+1/2at^2 and substitute the values in
Can you pls explain a little bit more apart from the formula
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2 years ago
#7
use s=1/2(v+u)*t for part (i) and then i think u use s=ut+1/2*at^2 for part (ii)
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Thread starter 2 years ago
#8
(Original post by Rauhan)
use s=1/2(v+u)*t for part (i) and then i think u use s=ut+1/2*at^2 for part (ii)
part iii please not those -the hence bit
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2 years ago
#9
yea sorry i didnt read the line you wrote at the end of the picture; lemme have a look at it
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2 years ago
#10
ok so since you know these things abt the parts

part 1
s=?
u=21
a= 0 since its projecting horizontally
t=t

part 2
s=?
u=5.25m/s
a= 0 since its projecting horizontally
t=t

now use the equation s=ut+1/2at^2 to find the distance in terms of t and u will end up having 2 simultanious equations
2
2 years ago
#11
i am still confused abt the part where they ask for the reason
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Thread starter 2 years ago
#12
(Original post by Rauhan)
ok so since you know these things abt the parts

part 1
s=?
u=21
a= 0 since its projecting horizontally
t=t

part 2
s=?
u=5.25m/s
a= 0 since its projecting horizontally
t=t

now use the equation s=ut+1/2at^2 to find the distance in terms of t and u will end up having 2 simultanious equations
Hi! Thanks for replying. Just attached ms below

Theyve done this weird thing for their method
0.75 x 21t =15.75t -->this doesn't make much sense
Do you know what they've done here?
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2 years ago
#13
dosent make sense to me either cu in part (iii) they never mentioned anything abt the distance except for finding it in terms of t and then in part (iv) finding the distance through simultaneous equations
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2 years ago
#14
what year is this question from
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Thread starter 2 years ago
#15
(Original post by Rauhan)
what year is this question from
its 2008 and yhh its confusing what they did there in the ms
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2 years ago
#16
i just figured it out; so whats the value of t u got in (i)
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