Question

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

• A. $6cm{s}^{-1}$
• B. $18cm{s}^{-1}$
• C. $12cm{s}^{-1}$
• D. $10cm{s}^{-1}$

Answer 1

Answer: (A)

$6cm{s}^{-1}$

Given:

Initial velocity is: $u=0$

Time is: $t=3s$
Acceleration is: $a=2cm{s}^{-2}$

From first equation of motion:

$v=u+at$
$v=0+2\times 3=6cm{s}^{-1}$