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I have another question but i didnt want to create two consecutive threads so im going to edit this one.

A bumper car at an amusement park ride traveling at .8m/s colides with an identical car at rest. This second car moves away with a speed of .5m/s What is the velocity of the first car after the collision.

so do i just use the law of conservation of momentum and disregard mass since they are all the same. if i do it that way i get .3m/s is that right?

Done with this-->{a .1 kg ball is thrown straight up into the air with an initial speed of 15m/s. Find the momentum of the ball (a) at its maximum height, and (b) halfway up to its maximum height.

The question im wondering is, at its maximum height is the velocity zero, since its going straight up, it eventually stops then goes down right, so would the final velocity be zero, or do i need to find the height then find the velocity. Its asking for the momentum at the maximum height, but at its maximum height it will have stopped making the momentum zero right? i think my question is a bit redundant, gets the point across though.

Ive missed a few days at school and this momentum thing is new to me and im lost.

thanks}--Done with this, hope i did it right

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# I should know this, but i dont.

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