Q. An object at rest on a flat, horizontal surface explodes into two fragments, one five times as massive as the other one. The lighter fragment gains the velocity of 10.0m/s in the left direction right after the explosion. On the other hand, the heavier fragment gains a velocity of v in the right direction after explosion and slides 50cm in the right direction before stopping. Find out the kinetic frictional coefficient between heavier fragment and surface.