What is the momentum (in kg m/s) of a 99- kg football player running at a top speed of 9.9 m/s? What is the momentum of a 8.92- g rifle bullet traveling at 738 m/s? ______A croquet mallet delivers an impulse of 8.37 N s to a 0.39- kg croquet ball initially at rest. What is the speed of the ball immediately after being struck?