A force of 186 N acts on a 7.0 kg bowling ball that was at rest. The bowling ball reaches a speed of 10.5 m/s. How much time was the force in contact with the ball?

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

Idon’t quite understand this problem

What is a good example of instantaneous speed