# Chapter 9 - Exercises and Problems - Page 171: 42

a) 1.46 Ns b) 27.04 kilograms

#### Work Step by Step

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: $.81m = .02 \times 73 \times 15 \\ \fbox{m=27.04 kilograms}$

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