A trolley, while going down an inclined plane, has an acceleration of 2 ,m ,s^{-2} . What will be it

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7. MOTION

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A trolley, while going down an inclined plane, has an acceleration of $2 \,m \,s^{-2}$. What will be its velocity(in $cm\,s ^{-1}$) $3\, s$ after the start ?

A

$0.6$

B

$6$

C

$12$

D

$18$

Solution

Initial Velocity of trolley, $u =0 \,cm\,s ^{-1}$

Acceleration, $a=2\, cm\, s ^{-2}$

Time, $t=3 \,s$

We know that final velocity, $v = u + at =0+2 \times 3 \,cms ^{-1}$

Therefore, The velocity of train after $3\, sec$ $=6\, cms ^{-1}$

Standard 9

Science

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