Who does more work, a person who lifts a 2-kilogram object .5 meters, or a person who lifts a 3-kilogram object .4 meters?

Ahot-air balloon is drifting straight downward with a constant speed of 2.40 m/s. when the balloon is 7.63 m above the ground, the balloonist decides to drop one of the ballast sandbags to the ground below. how much time elapses before the sandbag hits the ground?

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

What is the momentum of a 2 kg object moving at 15 meters per second