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Q.

An object is projected upwards with velocity of $100 {ms}^{- 1}$ . It will strike the ground after [g= $10 {ms}^{- 2}$ ]

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a

5 second

b

20 second

c

15 second

d

10 second

answer is B.

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Detailed Solution

time of flight

t = \frac{2u}{g} \Rightarrow \frac{2 \times 100}{10} = 20 s

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