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Question
A motorcycle is being driven at a speed of 20 m/s when brakes are applied to bring it to rest in five seconds. The deceleration produced in this case will be :
Options
+ 4 m/s2
− 4 m/s2
+ 0.25 m/s2
−0.25 m/s2
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Solution
We have,
Initial velocity = 20 m/s
Final velocity = 0 m/s
Time taken = 5 sec.
So,
Deceleration = – Acceleration
= –(0 – 20)/5
= 4 m/s2
So, the answer is + 4 m/s2
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