hi, Please help me with this problem, thanks. Harry pushes a box (that weighs 98 N) with a force of 20 N on ice. After he stops pushing the box is still in motion. The kinetic energy of the box is 20 J and the coefficient of friction is .05. Find a) Mass of the box? b) Force of friction on the box? c) Magnitude of work done by friction to stop the box? d) How far the box will slide before stopping? I figured out the 1st part. F= mg 98 N = m * 9.8 m/s^2 m= 10 kg The mass of the box is 10 kg. I don't know how to proceed further. Please help, thanks.