A student throws a 0.160-kg ball straight upwards to a height of 4.70 m. How much work did the student do?

7.4 J

Explanation:

m = mass of the ball = 0.160 kg

h = height gained by the ball = 4.70 m

g = acceleration due to gravity = 9.8 m/s²

U = Potential energy gained by the ball

Potential energy gained by the ball is given as

U = mgh

W = work done by student

Using conservation of energy

W = U

W = mgh

W = (0.160) (9.8) (4.70)

W = 7.4 J