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# AS physics questions watch

1. Studying AS physics and I'm stuck on this question, an object has a free fall constant acceleration of 9.81 ms-2 it goes past two light gates during it fall the the time interval between passing the first and the second is 0.269. The distance between the light gate is 1.36m
a) what is the object speed as it passes the the first light gate?
b) at what height above the first light was it drooped?
I have attempted A with the equation v=u+at and I got 2.64 ms and then I thought for B you had to do 2.64/9.81 but the book says its wrong
2. Well I did speed equals distance over time first nd got that answer but the book says its 3.74 for A and 0.712m for B and I no some answers in text books are wrong sometimes but it's difficult to no which it is
3. (Original post by Boarde)
Studying AS physics and I'm stuck on this question, an object has a free fall constant acceleration of 9.81 ms-2 it goes past two light gates during it fall the the time interval between passing the first and the second is 0.269. The distance between the light gate is 1.36m
a) what is the object speed as it passes the the first light gate?
b) at what height above the first light was it drooped?
I have attempted A with the equation v=u+at and I got 2.64 ms and then I thought for B you had to do 2.64/9.81 but the book says its wrong
In part a) you are given
s, distance between gates = 1.36m
a, accele due to gravity = 9.81m/s/s
t, time taken = 0.269s

There is a suvat equation containing s, u, a and t.
Use this to find u, the velocity at which it passes the first gate.

When you know this you can use this velocity as the final velocity for the first part of the drop from rest to the 1st light gate.
4. (Original post by Stonebridge)
In part a) you are given
s, distance between gates = 1.36m
a, accele due to gravity = 9.81m/s/s
t, time taken = 0.269s

There is a suvat equation containing s, u, a and t.
Use this to find u, the velocity at which it passes the first gate.

When you know this you can use this velocity as the final velocity for the first part of the drop from rest to the 1st light gate.

Thanks for that much appreciated

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Updated: April 9, 2013
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