Q. Besides the gravitational force, a 3.10-kg object is subjected to one other constant force. The object starts from rest and in 1.20 s experiences a displacement of (5.15{i} - 3.30{j}) m, where the direction of {j} is the upward vertical direction.
Determine the other force and write it in component form (both components rounded to one decimal)
Q. A 350 kg piano slides 3.5 m down a 27 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. Calculate the force exerted by the man, the work done by the man on the piano, the work done by the friction force, the work done by the force of gravity, and the net work done on the piano.