Question 3
A trolley, while going down an inclined plane, has an acceleration of $2 c m s^{- 2} .$ What will be its velocity 3 seconds after the start?

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Solution

Given, initial velocity of the trolley, $u = 0$ , acceleration, $a = 2 c m s^{- 2}$ and time, $t = 3 s$
We know that final velocity, $v = u + a t = 0 + (2 \times 3)$ $= 6 c m s^{- 1}$
Therefore, the velocity of trolley after 3 seconds $= 6 c m s^{- 1}$

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