# physics!

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Wildlife biologists fire 22g rubber bullets to stop a rhinoceros charging at 0.84 m/s. The bullets strike the rhino and drop vertically to the ground. The biologists' gun fires 15 bullets each second, at 72 m/s, and it takes 36 s to stop the rhino. What impulse does each bullet deliver? as well as What's the rhino's mass? Neglect forces between rhino and ground.

• physics! -

impulse = change in momentum = .022*72 for each bullet

total change in bullet momentum + total change in rhino momentum = 0
so
number of bullets*.022*72 = m * .84

• physics! -

For part b, divide the speed of the rhino by the time it takes to stop it which would give you the acceleration.

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