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If a trolley starts from rest with an acceleration of $2 m / s^{2}$ , the velocity of the body after $4 s$ would be__ $m / s$ ?

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2

4

8

6

answer is C.

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Detailed Solution

If a trolley starts from rest with an acceleration of

2 m / s^{2}

, the velocity of the body after

4 s

would be

8 m / s

.
We know that

v = u + at

Here,

u = 0

, as the body starts moving from rest

a = 2 m / s^{2}

Then
⇒

v = 0 + 2 \times 4

⇒

v = 8 m / s

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