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1st Equation of Motion

The accelerat...

Question

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

20 m / s

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22 m / s

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24 m / s

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18 m / s

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Solution

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

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