Answer to Question #300973 in Physics for Good heart

Question

A 2.0kg mass fails 400cm.

(a) how much work was done on it by gravitational force?

(b) how much PEG did it lose?

(c) given that work is the transfer of energy where does that energy end up?

Answer 1

(a) how much work was done on it by gravitational force?

$$W=mgh=2.0*9.8*4.0=78.4\:\rm J$$

(b) how much PEG did it lose?

$$\Delta E_p=W=78.4\:\rm J$$

(c) given that work is the transfer of energy where does that energy end up?

up: potential energy

down: kinetic energy