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Q.

In the Figure, find the change in velocity at t = 5 seconds. Given acceleration is in m s–2 and time is in seconds.

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a

5 m s–1

b

15 m s–1

c

35 m s–1

d

25 m s–1

answer is A.

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Detailed Solution

Here, we find that the acceleration is not constant, and we cannot use the equation

v = u + at.

∴ Change in velocity = area under the a – t curve

= 1/2 × 5 × 10 = 25 m s–1

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In the Figure, find the change in velocity at t = 5 seconds. Given acceleration is in m s–2 and time is in seconds.