A 25.5 kg child swings on a swing set. At the top of the swing's arc, the child reaches a height of 1.50 m from the
ground. What are the child's PE and KE at the top of the arc?
188 J and 1883
OJ and 375)
375 J and OJ

375 J and 0J

Explanation:

At the top of the arc, the child's height is 1.5m from the ground.

mass, m = 25.5 kg, assume g = 9.81m/s²

Hence,

Potential Energy, PE

= mgh

= (25.5) (9.81) (1.5)

= 375.23

= 375 J (answer, nearest whole number)

Note that at the top of the arc, the boy will momentarily come to a complete stop (i.e velocity = 0)

Hence the Kinetic Energy will be 0 at the top of the arc.  (answer)

The answer would be A. efficiency