A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 45 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 352 J?

Question

Tyrese

Physics

15 May, 05:52

A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 45 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 352 J?

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Answers (1)

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Kyle Yang · Answer 1

Work is obtained by multiplying the force and the object's displacement. The force and displacement and force should be in the same direction in order to have work.

W = F x d

d = W / F

Substituting the known values,

d = 352 J / 45 N = 7.82 m

Thus, the displacement of the student is 7.82 m.