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Question

# A train starts from rest and accelerate uniformly at the rate of 5 m/s2 for 5 sec. Calculate the velocity of train in 5 sec.

A
20 m/s
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B
25 m/s
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C
10 m/s
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D
5 m/s
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Solution

## Step 1, Given dataAs the train starts from rest, the initial velocity of the train, say, vi=0Time = 5 secAcceleration = 5 m/s2 Step 2, Finding the velocityLet the velocity of train be v in 5 sFrom the equation of motionWe know,v=u+at Putting all the valuesv=0+5×5 After solvingv = 25 m/sHence the final velocity of the train is 25 m/sThe correct option is (A) 25 m/s

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