12:58 PM No Service 59% session mastering physics.com Problem 7.21 MasteringPhys

Question

12:58 PM No Service 59% session mastering physics.com Problem 7.21 MasteringPhysics Problem 7.21 A 93-kg fullback is running at 3.7 m/s to the east and is stopped in 0.85 s by a head-on tackle by a tackler running due west. Part A Calculate the original momentum of the fullback. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the momentum is to the east, and negative value if the direction of the momentum is to the west. kg-m po 340 Give Up Submit Correct Part B Calculate the impulse exerted on the fullback. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the impulse is to the east, and negative value if the direction of the impulse is to the west.

Explanation / Answer

(A) pi = m vi

= 93 x 3.7

= 344.1 kg m/s

(b) impulse is change in momentum = Pf - Pi

= 0 - 344.1

= - 344.1 kg m/s

(c) impulse on trackler = 344.1 kg m/s

(d) impulse = F x time

344.1 = F ( 0.85)

F = 404.8 N

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