A teeshirt guns res a shirt with a mass of 0.085 kg of mass at a speed of 20 m/s. If the gun has a mass of 1.75 kg, what is the velocity of the recoil? Consider the velocity of the shirt as positive and the velocity of the recoil negative. Show how you got your answer. A baseball is dropped from a second story window that is 5.0 meters above the ground. How fast is the baseball moving just before it hits the ground, assuming air resistance is negligible? Show how you got your answer. An athlete lifts a barbell with a total mass of 20 kg a distance of 0.80 m in 0.95 s. How much power does this require? Show how you got your