A 400 n box starts from rest from top of a ramp that has a length of 1.3 m and height of 0.5 m. The box slide to the bottom of the ramp where the gravitational potential energy is zero. The speed of the box at the bottom the ramp is 2m/s. There is a fiction on the box by the ramp. what is the work done by the friction and what is the coefficient of the friction?
A) The work done by friction is positive, and the coefficient of friction is zero.
B) The work done by friction is negative, and the coefficient of friction is greater than zero.
C) The work done by friction is negative, and the coefficient of friction is zero.
D) The work done by friction is positive, and the coefficient of friction is greater than zero.