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# CBSE Class 9 Answered

A train starting from rest attains a velocity of 72 km/hr in 5 minutes. Assuming that the acceleration is uniform find the acceleration. *

Asked by jainpranav33047 | 20 Jul, 2021, 09:28: AM
Expert Answer
Speed 72 km/hr = 72 × (5/18) = 20 m/s

Let us use the relation , v = u + ( a t )

where v = 20 m/s is final speed , u = 0 m/s is initial speed because train starts from rest , a is acceleration
and t = 5 min = 300 s is time taken to reach the final speed.

Hence ,   20  = a ( 300 )

Hence acceleration  a = 0.067 m/s2
Answered by Thiyagarajan K | 20 Jul, 2021, 08:25: PM

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