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Question

(a) Write the formula for acceleration. Give the meaning of each symbol which occurs in it.

(b) A train starting from railwaystation attains a speed of 21 ms in one minute. Find its acceleration.


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    Solution

    (a) Let the initial velocity be 'u' and final velocity be 'v'.
    Time taken to change the velocity from u to v = 't'
    We know that acceleration means a change in velocity.
    Hence, acceleration = (vu)t

    (b) Initial velocity of train = 0
    Final velocity of train = 21 ms
    Time taken = 1 minute = 60 sec
    So, acceleration = (Change in velocity)time = (vu)t = (210)60 = 2160 = 0.35 m/s2


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