Two objects were lifted by a machine. one object had a mass of 2 kilograms, and was lifted at a speed of 2m/sec. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. which object had more kinetic energy while it was being lifted ?

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)