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CBSE Class 9 Answered

A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity if retardation due to applying brakes is 2 m/s2.
Asked by Topperlearning User | 09 Nov, 2016, 03:51: PM
answered-by-expert Expert Answer

Given:

Final velocity v = 0

Time taken t = 20 s

Acceleration a = -2 m/s2

From the equation v = u + at, we have

u = v - at

→ u = 0 - (-2) × 20

→ u = 40 m/s2

Answered by | 09 Nov, 2016, 05:51: PM

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