Question

9.
A train starting from rest attains a velocity of 72 km/h
in 5 minutes. Assuming that the acceleration is
uniform, find the acceleration
​

Answer 1

Given :-

A  train starting from rest attains a velocity of 72 km/h

in 5 minutes

To Find :-

Acceleration

Solution :-

We know that

1 km/h = 5/18 m/s

72 km/h = 72 × 5/18 = 4 × 5 = 20 m/s

1 min = 60 sec

5 min = 60 × 5

5 min = 300 sec

Now

a = v - u/t

a = 20 - 0/300

a = 20/300

a = 2/30

Hence

Acceleration is 2/30 m/s²

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