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needhelp83
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The driver of an automobile traveling at 80 km/h suddenly slams on the brakes and stops in 2.8 s. What is the average deceleration during braking
Velocity of driver=(80 km/h)(1 h/3600 s)(1000 m/1 km)=22.22 m/s
average acceleration=change of velocity/time elapsed
Acceleration = final velocity - initital velocity / time
Acceleration=(0 - 22.22 m/s)/2.8 s=-7.94 m/s/s
Average deceleration= 7.94 m/s/s
Just double checking
Velocity of driver=(80 km/h)(1 h/3600 s)(1000 m/1 km)=22.22 m/s
average acceleration=change of velocity/time elapsed
Acceleration = final velocity - initital velocity / time
Acceleration=(0 - 22.22 m/s)/2.8 s=-7.94 m/s/s
Average deceleration= 7.94 m/s/s
Just double checking