A ball projected from ground vertically upward is at same height at time t₁ and t₂ . speed of pr

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2.Motion in Straight Line

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A ball projected from ground vertically upward is at same height at time $t_1$ and $t_2$. The speed of projection of ball is [Neglect the effect of air resistance]

A

$g\left[t_2-t_1\right]$

B

$\frac{g\left[t_1+t_2\right]}{2}$

C

$\frac{g\left[t_2-t_1\right]}{2}$

D

$g\left[t_1+t_2\right]$

Solution

(b)

$t_1+t_2=$ total time of flight

$t_1+t_2=2 T$

$T=\frac{t_1+t_2}{2}$, also $T=\frac{u}{g}$

$\frac{u}{g}=\frac{t_1+t_2}{2} \Rightarrow u=\frac{1}{2} g\left(t_1+t_2\right)$

Standard 11

Physics

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