Please help! I will give brainliest. Marcy drops a ball off the top of the empire state building. How fast is the ball traveling after 4 s? (assume there is no air)

How would air change the speed?

If steel is more dense that lake water, why can a boat float

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)

Ihave this 50 question test the layer of earth's atmosphere where atoms and molecules escape into space is referred to as the a) exosphere b) ionosphere. c) mesosphere d) thermosphere