Block A weighs 19.9 lb and is moving toward the left with a velocity of 4 ft/s just before it is struck by the bullet B from a caliber 50 machine gun. The coefficient of kinetic friction between A and the plane is 0.25. The bullet weighs 0.10 lb and is fired into the center of block A with a velocity of 2900 ft/s to the right.
a) What is the final velocity of the block-bullet combination?
b) how long will block A continue to move after the embedment of the bullet?
c) What percentage of system energy is lost during impact?