Atrain travels 79 kilometers in 4 hours and then 65 kilometers in 3 hours what is it average speed

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

An object's buoyant force and weight mean the same thing. a. trueb. false