p07_050.pdf

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Chapter 7 - 7.50
50. (a) In the work-kinetic energy theorem, we include both the work due to an applied force W a and work
done by gravity W g in order to find the latter quantity.
∆ K = W a + W g =
30=(100)(1 . 8)cos180 ◦ + W g
leading to W g =210 J.
(b) The value of W g obtained in part (a) still applies since the weight and the path of the child remain
the same, so ∆ K = W g =210 J.
⇒

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