Consider two bricks which each have a mass of 2 kg. One is lying on the ground,
ID: 1575372 • Letter: C
Question
Consider two bricks which each have a mass of 2 kg. One is lying on the ground, and one is placed on a bookshelf 1 meter above the ground. Take g=9.8. Which of the following statements is MOST correct?
a)The potential energy of the brick on the shelf is 19.8 Joules and the potential energy of the brick on the ground is 0 Joules.
b)The potential energy of both bricks is zero because they are not moving.
c)The potential energy of the brick on the shelf is 19.6 Joules greater than the potential energy of the brick on the floor.
d)The potential energy of the brick on the shelf is -19.6 Joules and the potential energy of the brick on the ground is 0 Joules.
Explanation / Answer
potential energy u = mgh
u = 2*9.8*1 = 19.6 J
a brick on the self has the potential energy is 19.6 J
a brik in the groung has zero potential energy
so option a and c is correct