Question #106822

A student wearing frictionless roller skates on a horizontal surface is pushed by a friend with a constant force of 50.0 N. How FAR must the student be pushed, starting from rest, so that her final kinetic energy is 350 J?

Expert's answer

The change of energy is equal to work done

"K_f-K_i=W=Fd"Hence, the distance

"d=\\frac{K_f-K_i}{F}=\\frac{350-0}{50.0}=7\\:\\rm m"
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