A rock has a mass of 12.5 kg. It is dropped off a cliff that is 75.0 meters high. Find the Potential Energy of the rock at the top of the cliff. (b) What will the Kinetic ergy of the rock be just before it hits the ground. (c) What velocity will the rock have before it hits the ground? VENS w/Units Write Formula and Solve​

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?