Joel has a mass of 50kg he is spending his firs day on skis. his friend is trying to push him across a level patch of snow. joel friend is pushing with 60n of force but joel does not move why?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)