A body is projected with a velocity u . It passes through a certain point above ground after t₁ se

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2.Motion in Straight Line

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A body is projected with a velocity $u$. It passes through a certain point above the ground after $t_1$ second. The time interval after which the body passes through the same point during the return journey is

A

$\left(\frac{u}{g}-t_1^2\right)$

B

$2\left(\frac{u}{g}-t_1\right)$

C

$\left(\frac{u}{g}-t_1\right)$

D

$\left(\frac{u^2}{g^2}-t_1\right)$

Solution

(b)

Velocity of particle of this instant will be $v=\left(u-g t_1\right)$

Now, the desired time interval will be $\frac{2 v}{g}$ or

$\frac{2\left(u-g t_1\right)}{g}=2\left(\frac{u}{g}-t_1\right)$

Standard 11

Physics

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