Asoccer ball has a mass of 0.40 kg. initially, it is moving to the left at 20m/s, but then it is kicked and given a velocity of 45 degrees upward and to the right, with a magnitude of 30m/s. find the impulse of the net force and the average net force, assuming a collision time of .010 seconds.

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.