Answer:
Work done by the force of friction is 305.96 joules.
Explanation:
It is given that,
Mass of the child, m = 21 kg
Height of the slide, h = 1.5 m
Speed of the child at the bottom, v = 0.51 m/s
Let W is the work done by the force of friction on the child. It can be calculated using the work energy theorem as :
W = -305.96 joules
So, the work done by the force of friction on the child is 305.96 joules. Hence, this is the required solution.