Wildlife biologists fire 20-g rubber bullets to stop a rhinoceros charging at 0.81m/s . The bullets strike the rhino and drop vertically to the ground. The biologists' gun fires 15 bullets each second, at 81m/s , and it takes 31s to stop the rhino.
Part A What impulse does each bullet deliver?
Part B What's the rhino's mass? Neglect forces between rhino and ground.