First slide

Average Velocity

Question

Average velocity during a journey of 240 m with uniform acceleration of 5 m/ $s^{2}$ is 40m/s. The initial velocity of the body is

Moderate

A

$25 m / s$
B

$20 m / s$
C

$35 m / s$
D

22.5 m/s

Solution

displacement = average velocity x time
$s = (\frac{u + v}{2}) t$ and $\frac{v + u}{2} = 40$
$240 = 40 t$
t =6 again $v - u = a t$ or, $v - u = 30$
solving for u we get u =25 m/s

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