First slide

Vertical projection from ground

Question

A body is projected vertically upward with a velocity of 20 m/s from a point on ground. It g = 10 m/s2, average speed of body during the course of its flight is

Moderate

A
10 m/s
B
$10\sqrt{2}$ m/s
C
$5\sqrt{2}$ m/s
D
15 m/s

Solution

Average speed = $\frac{2 H_{m a x}}{T} = \frac{2 (\frac{u^{2}}{2 g})}{\frac{2 u}{g}} = \frac{u}{2} = \frac{20}{2} m / s = 10 m / s$

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