A box slides down a 28° ramp with an acceleration of 0.98 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

Answer 1

m g down ramp = m g sin 28
mg normal = m g cos 28

m g sin 28 - mu m g cos 28 = m (.98)

sin 28 - mu cos 28 = .98/9.81