A Bungee jumper on a different planet has a mass of 70kg. he stands 100m above the ground and knows his gravitational potential energy is 105,000 Joules. what is the gravity on that planet? (GPE=meh)

Arock is dropped from a cliff and reaches the ground in 2.70s. at the same time another rock is thrown horizontally from the same height with initial x velocity of 0.95 m/s. what distance will in x will the second rock cover?

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match