If the action force is a player kicking a soccer ball, then what is the reaction force? the ball accelerating in the direction of the kick
the ball moving at a constant speed in the direction of the kick
the ball accelerating in the opposite direction of the kick
the ball pushing on the player in the opposite direction of the kick

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.