p07 050

background image

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) cos 180

+ 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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