A trolley, while going down an inclined plane,
Question.
A trolley, while going down an inclined plane, has an acceleration of 2 cms–2. What will be its velocity 3 s after the start ?

Solution:
Given, initial velocity, $\mathrm{u}=0$; final velocity, $\mathrm{v}=?$
Time, $\mathrm{t}=3 \mathrm{~s}$
Acceleration, $\mathrm{a}=2 \mathrm{cms}^{-2}$
We know that, $\mathrm{v}=\mathrm{u}+\mathrm{at}$
or $\mathrm{v}=0+2 \times 3=6 \mathrm{cms}^{-1}$
Therefore, final velocity $=6 \mathrm{cms}^{-1}$.
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