A ball of mass 0.125 kg moves with a velocity of 2 m/s. The ball hits another ball of mass 1 kg that is initially at rest. After the collision, the first ball recoils with a velocity of 1.5 m/s. Calculate the velocity of the second mass.

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )