A 0.75 kg cart moving at 2.1 m/s collides with another cart and bounces backward at 0.9 m/s. If the force applied to the cart was 4.5 N, for how much time did the collision last?

A0.5-kg object is connected to a spring that undergoes oscillatory motion. there is friction between the object and the surface it is kept on given by coefficient of friction μk = 0.06 . if the object is released 0.2 m from equilibrium, what is the distance that the object travels? given that the force constant of the spring is 50 n m-1 and the frictional force between the objects is 0.294 n.