## Essential University Physics: Volume 1 (3rd Edition)

a) We know that the impulse is equal to the change in momentum. After hitting the rhino, the bullet has no momentum, so we find: $J = m\Delta v = .02 \times 73 = \fbox{1.46 Ns}$ b) We know that the momentum of all of the bullets adds to the initial momentum of the rhino. Thus: $.81m = .02 \times 73 \times 15 \\ \fbox{m=27.04 kilograms}$