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Question

A moving bus is brought to rest within 30 seconds by applying brakes. What is its initial velocity, if the retardation due to brakes is 2 ms2?

A
60 ms1
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B
15 ms1
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C
40 ms1
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D
30 ms1
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Solution

The correct option is A 60 ms1
Given:
Time, t=30 sec
Retardation, a=2 m/s2
Final velovity, v=0
From equation of motion
v=u+at
0=u2×30
u=60 m/s

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