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duke1

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A 62.0 kg male dancer leaps 0.31 m high.

(a) With what momentum does he reach the ground?

kgm/s

(b) What impulse is needed to stop the dancer?

Ns

(c) As the dancer lands, his knees bend, lengthening the stopping time to 0.050 s. Find the average force exerted on the dancer's body.

N

(d) Compare the stopping force with his weight.

(stopping force/dancer's weight)

So the main problem is I can't find any worked out examples of these problems in our book. I may be wrong but I just don't see how to find momentum without another bit of information besides hieght and mass. So I'm stuck and don't even really know where to start trying to work it out. There is a time given in C but it doesn't apply yet to A.

Any ideas?? Help is really appreciated.

bp