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**[SOLVED] Potential/Kinetic Energy Problem need help ASAP**

A small sports car and a pickup truck start coasting down a 10.0 m hill together, side by side. Assuming no friction, what is the velocity of each vehicle at the bottom of the hill? Submit answer in m/s; sports car, then truck.

I don't know how to figure this one out, I know it deals with conservation of energy but I don't know how to calculate it when all I have been given is one variable.

Working at a firing range you are tasked to determine the muzzle speed of a bullet as it exits an experimental rifle.

You set up a ballistic pendulum in order to conduct your experiment. The pendulum is made of a block of wood suspended from a set of strings. You fire the bullet into the stationary block and measure the speed of the combined bullet and block since the bullet lodges inside the block. You measure the mass of the bullet to be 4.20 g, the mass of the block to be 500. g, and the speed of the combined bullet and block to be 6.75 m/s. Calculate the speed of the bullet (muzzle speed) and give your answer in m/s.

I am completely lost on this one. I am taking an online class and my instructor is taking forever answering a couple of questions I have about these problems. I just need some help with getting pointed into the right direction.

Thanks