A worker lifts a box on the roof of a building 15m high at a constant speed If the work of the force exerted by the worker is 300J, find the weight and mass of the box.

i would think form in reponse to tensional forces

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

truck y has a greater velocity than truck x.