A 84-kg fullback is running at 3.9 m/s to the east and is stopped in 0.85 s by a

Question

A 84-kg fullback is running at 3.9 m/s to the east and is stopped in 0.85 s by a head-on tackle by a tackler running due west.

MasteringPhysics: Chapter 7- Google Chrome https://session.masteringphysics.com/myct/itemView?assignmentProblemID-51657891&offset;=next PHYS211-Spring2016-UTM Help | Close ChapterZProblem 7.21 Resources previous | 9 of 14 | next » Problem 7.21 Part A A 84-kg fullback is running at 3.9 m/s to the east and is stopped in 0.85 s by a head-on tackle by a tackler running due west. 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. Po= Value Units alne Submit My Answers Give Up 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. (Ft)fullback- fallbackV alue Units Submit My Answers Give Up Part C Calculate the impulse exerted on the tackler. 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. GIANCOLLch07.p17jpg Show all downloa 4:23 PM 4/6/2016

Explanation / Answer

mass ,m=84 kg

speed, v=3.9 m/sec

contact time, t=0.85 sec

a)

change in momentum dp=(m*v) -0

dp=m*v

dp=84*(3.9)

dp=327.6 kg.m/sec

and

impulse, I=change in momentum,

I=327.6 kg.m/sec

b)

avg force, F=dP/dt

F=327.6/(0.85)

F=385.41 N

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