Question

The acceleration of the particle moving in positive $x-$direction with an initial velocity of $10\text{m/s}$ is $3{\text{m/s}}^2$. Its velocity at $t=4sec$ is

• A. $20\text{m/s}$
• B. $22\text{m/s}$
• C. $24\text{m/s}$
• D. $18\text{m/s}$

Answer 1

The correct option is B $22\text{m/s}$

Given, $a=3{\text{m/s}}^2,u=10\text{m/s}\text{and}t=4sec$
Using first equation of motion we have
$v=u+at$
$\Rightarrow v=10+3\times 4=22\text{m/s}$
Hence, velocity at $t=4sec$ is $22\text{m/s}$.