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 kg#, temperature of #320 ^oC#, and a specific heat of #25 J/(kg*K)# is dropped into a container with #16 L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?