A man sits with his back against the back of a chair, and he pushes a block of mass m = 2.5 kg straight forward on a table in front of him, with a constant force F = 45 N, moving the block a distance d = 0.31 m. The block starts from rest and slides on a Iow-friction surface.

(a) How much work does the man do on the block?

(b) What is the final kinetic energy K of the block?

(c) What is the final speed 17 of the block?

(d) How much time At did this process take?

(e) Consider the system of the man plus the block: how much work does the chair do on the man?

(f) What is the internal energy change of the man?