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AP® Physics 1 & 2

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Moderate

Energy of Child on a Slide

APPH12-UFDBKI

A girl is playing on a frictionless slide. When she is at the top of the slide, the child-Earth system has 1,000 J of gravitational potential energy, using the bottom of the slide as the reference level. She gives herself a push so that she also possesses 400 J of kinetic energy at the beginning of her motion down the slide.

How much kinetic energy will the child have when she reaches the bottom of the slide?

A

1400 J + the work done on the child by gravity

B

1400 J + the work done on the child by friction

C

1400 J + the work done on the child by the normal force

D

1,400 J