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When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then retardation will be :

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When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then retardation will be :
A. `+2m//s^(2)`
B. `-2m//s^(2)`
C. `-0.5m//s^(2)`
D. `+0.5m//s^(2)`
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Correct Answer - D
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