What force accelerates a 500 kg object at 5 m/s2?

What are two different ways you could find the value of a? explain these methods.

More solar radiation is absorbed by earth’s surface than by

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.