An object is projected upwards with a velocity of $100 m / s$ . It will strike (approximately)

10 s e c

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20 s e c

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15 s e c

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5 s e c

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Solution

The correct option is A $20 s e c$
Given,
$u = 100 m / s$
$v = 0 m / s$ ( at the highest point)
$g = - 10 m / s^{2}$
From the 1st equation of motion,
$v = u - g t$
$0 = 100 - 10 t$
$t = 10 s$
The time taken to reach the ground is $10 s + 10 s = 20 s$ .
The correct option is B.

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