An 83.0-kg running back leaps straight ahead toward the end zone, with a speed of 6.50 m/s. A 115-kg linebacker, keeping his feet on the ground, catches the running back and applies a force of 900. N in the opposite direction for 0.750 s before the running back's feet touch the ground.
a) What is the impulse that the linebacker imparts to the running back?
b) What change in the running back's momentum does the impulse produce?
c) What is the running back's momentum when his feet touch the ground?
d) If the linebacker keeps applying the same force alter the running back's feet have touched the ground, is this still the only force acting to change the running back's momentum?
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