A 0.1 kg toy contains a compressed spring. when the spring is released the toy fly 0.45 m upwards from ground level before falling back down to the ground. what is the speed of the toy when it hits the ground.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.