Lisa rushes down onto a subway platform to find her train already departing. she stops and watches the cars go by. each car is m long. the first moves past her in s and the second in s. find the constant acceleration of the train.

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little