An 80-kg running back leaps straight ahead toward the end zone with a speed of 6

Question

An 80-kg running back leaps straight ahead toward the end zone with a speed of 6.6 m/s. A 115-kg linebacker, keeping his feet on the ground, catches the running back and applies a force of 818 N in the opposite direction for 0.70 s before the running back's feet touch the ground.
(a) What is the impulse that the linebacker imparts to the running back?
magnitude
direction

(b) What change in the running back's momentum does the impulse produce?
magnitude
direction

(c) What is the running back's momentum when his feet touch the ground?
magnitude
direction

(d) If the linebacker keeps applying the same force after the running back's feet have touched the ground, is this still the only force acting to change the running back's momentum?
Yes No

Explanation / Answer

impulse = 818*0.70

= 572.6 N.s

impulse = change in momentum

= 572.6 N.s

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