When a car driver travelling at a speed of 10 m/s applies brakes
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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) + 2 m/s2

(b) – 2 m/s2

(c) – 0.5 m/s2

(d) + 0.5 m/s2

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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 +0.5 m/s2.

So, the correct answer of this question is option (d).

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