1. You are holding an 85 kg trunk at the top of a ramp that slopes from a moving van to the ground, making an angle of 35^o with the ground. You lose your grip and the trunk begins to slide.  If the coefficient of friction between the trunk and the ramp is 0.42

a. What is the acceleration of the trunk? 

b. If the trunk slides 1.3 m before reaching the bottom of the ramp, for what time interval did it slide?