When an object is lifted 8 meters off the ground, it gains a certain amount of potential energy. If the same object is lifted 16 meters off the ground, its potential energy is

A.

four times as much.

B.

three times as much.

C.

twice as much.

D.

the same.

The formula is Pe = F * d If you double D, you are going to double Pe

Try it. They don't give a number for F but you can invent one. Call F = 5 N

Pe = 5 N * 8 m

Pe = 40 Nm = 40 J

Pe = 5 N * 16 m

Pe = 80 Nm = 80 J

Double the distance means double the Pe

Pick C.