First slide

Rectilinear Motion

Question

A body moving with uniform acceleration of $5 m / s^{2}$ changes its velocity from initial value of $10 m / s$ to final value of $30 m / s$ . Find the time taken by it

Easy

A

1S
B

2S
C

3S
D

4S

Solution

Given that Initial velocity $u = 10 m / s$
Final velocity $V = 30 m / s$
Acceleration $a = 5 m / s^{2}$
$∴$ From kinematic equation of motion $V = u + a t$
$\begin{array}{l} \Rightarrow t = \frac{V - u}{a} \\ = \frac{30 - 10}{5} \\ = \frac{20}{5} = 4 s \end{array}$

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