Question

A 4.0 kg ball starts from rest and rolls down a hill 3.5 m high and up an adjoining hill 2.5 m high. How much potential energy does it have at the top of the first hill?

Answer 1

Answer:

$potential \: energy = mgh \\ m = mass \\ g = grvitational \: acceleration \\ h = height$

$pe = mgh\\ = 4 \times 3.5 \times 10 \\ = 140j$