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this is my equation which I'm unsure about

1. f*s= .5mv^2f - .5mv^2i

2. f= .5(82.5)(97.5^2)/37.5

I just want to know if I'm right so far, thanks!

What is the theoretical minimum force Matt must provide to the handle of his car jack if he moves his jack handle .45 m each time he lifts his 17000 N car .004m?

I have no idea how to do this one. F=mg?...

Hideaki Fukuda is in a 475.0kg roller coaster that is poised, motionless, atop a 77.50, hill. How fast will the frictionlest coaster be moving at the top of the next hill, 62.250 m high?

I don't understand this problem and I have no idea what equation to use.

help please!