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7. MOTION
medium
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