An object is projected upwards with a velocity of 100 m/s.The time after which

Question -

An object is projected upwards with a velocity of 100 m/s.The time after which it will strike the ground is (g = $10 m s^{- 2})$

Options:

A . 10 sec

B . 20 sec

C . 15 sec

D . 5 sec

Answer: Option B
:
B

Time of flight = $\frac{2 u}{g} = \frac{2 \times 100}{10} = 20 s e c$

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