Answers edited by Carlos S.

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From a rifle of mass 4 kg, a bulle of mass 50 g is fired with an initial velocity of 35 m s^-1. What is the the initial recoil velocity of the rifle?
An object with a mass of $1 k g$ $1 kg$ , temperature of $320^{o} C$ $320 ^oC$ , and a specific heat of $25 \frac{J}{k g \cdot K}$ $25 J/(kg*K)$ is dropped into a container with $16 L$ $16 L$ of water at $0^{o} C$ $0^oC$ . Does the water evaporate? If not, by how much does the water's temperature change?