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1. A railway truck of mass 10 tonnes is travelling at 3 ms-1 along a siding when it hits some buffers. After
the impact it is travelling at 1.5 ms-1 in the opposite direction.
Take the initial direction of travel to be the positive direction.
a) Find the initial momentum of the truck.
b) Find the momentum of the truck as it leaves the buffers.
c) Find the impulse that has acted on the truck.

A van of mass 2500 kg starts from rest. For the first 4 seconds the driving force from the engine is
given by F(t) = 2400t – 300t2 (0 < t < 4).
a) Find the total impulse on the van, from the driving force, over these 4 seconds.
b) Find the speed of the van after 4 seconds, assuming that resistances can be ignored.
2. Which part you stuck on?
Which part you stuck on?
All of it
4. Do you know what the equation for momentum is?
Do you know what the equation for momentum is?
I'm not really sure, I know the conservation of momentum stuff but for some reason my brain is just failing me
6. (Original post by William120180)
I'm not really sure, I know the conservation of momentum stuff but for some reason my brain is just failing me
Ok, so the formula for momentum of an object is given by p(momentum)=mv, where m is mass and v is velocity. You start by defining a direction to be positive and the other to be negative. For the first and second part just use the formula but remeber to use the correct speed. For the third part the impulse is given by final momentum-intial momentum. Try it now and tell me if you're stuck.

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