a 1000n force is applied to a 5 kg block at an angle of 20o with the vertical. the block is initially at rest. when the block reaches a speed of 6m/s the force stops pushing on the block. (a) through what distance was the force applied? (b) the block continues to slide down the incline plane. what is the change in potential energy due to gravity when the block moves from the top of the track to the bottom of the track? (c) what is the kinetic energy of the block when it is at the bottom of the track? (d) a spring (k