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A trolley, starting from rest while going down an inclined plane, has an acceleration of $2 cm / s^{2}$ . What will be its velocity after $3 \sec$ from the start?

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3 cm / s^{}

5 cm / s^{}

2.5 cm / s^{}

6 cm / s^{}

answer is D.

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Detailed Solution

A trolley, starting from rest while going down an inclined plane, has an acceleration of

2 cm / s^{2}

. Its velocity after

3 \sec

from the start is

6 cm / s^{}

.
Initial velocity,

u = 0

Acceleration,

a = 2 cm / s^{2}

Time,

t = 3 s

Final velocity,

v = ?

From the first equation of motion,

v = u + at

= 0 + 2 \times 3

\Rightarrow v = 6 cm / s

Velocity after

3 \sec

6 cm / s^{}

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