The uniform 60-kg crate C rests uniformly on a 10-kg dolly D. If the front casters of the...

The uniform 60-kg crate C rests uniformly on a 10-kg dolly D. If the front casters of the dolly at A are locked to prevent rolling while the casters at B are free to roll, determine the maximum force P that may be applied without causing motion of the crate. The coefficient of static friction between the casters and the floor is µf = 0.35 and between the dolly and the crate, µd = 0.5.