Question

4. When a car driver travelling at a speed of 20 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be: * (a) + 1 m/s2 (b) - 1m/s2 (c) - 0.5 m/s2 (d) + 0.5 m/s2​

Answer 1

Answer:

Final velocity = 0 m/s

Initial velocity = 20 m/s

Time = 20s

Retardation = Change in velocity

Retardation = Change in velocity Time

Therefore..

Retardation =

$= \frac{0 - 20}{20} \\ = \frac{ - 20}{20 } \\ = - 1 {m} {s}^{2}$

Therefore..

Option B) is correct

Explanation:

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