when a car driver travels at the speed of 10 meter per sec applies brakes and brings the car to rest in 20 sec.then the retardation will be.
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2 may be the answer for thus
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initial velocity is equal to 10 metre per second
final velocity is equal to zero metre per second
time taken is equal to 20 seconds
retardation is equal to-(v-u)/t
that is equal to -(0-10)/20=1/2=0.5m/s
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