Question

A rock is at the top of a 30 meter tall hill. It has a

mass of 10 kg. How much potential energy does
it have?

Answer 1

Step-by-step explanation:

Explanation

PE = mgh

The mass once stated, cannot be altered. You cannot decide that 1/2 down its fall, it becomes 25 kg. The mass is fixed once it has a value.

g for your intents is a constant.

h is the only thing you can change.

Givens

m = 10 kg

g = 9.81 m/s^2

h = 30 m

Solution

PE = m*g*h Substitute the givens into the equation

PE = 10 * 9.81 * 30

PE = 2943 Joules

Note a Joule is made of Kg m^2/sec^2