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Question

An airplane is flying at a height of $$1960\ m$$ in the horizontal direction with a velocity of $$360\ km/hr$$. It drops a bomb. The bomb strikes a point on the ground, then the time took $$t$$ by the bomb to reach the ground is:


A
202sec
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B
20sec
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C
102sec
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D
10sec
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Solution

The correct option is B $$20\sec$$
As the bomb is dropped so its initial vertical velocity will be $$zero.$$ 
so time taken by bomb will be given by $$h=0+\dfrac{1}{2}gt^2$$
or $$t=\sqrt{\dfrac{2h}{g}}=\sqrt{\dfrac{2\times 1960}{9.8}}=20second$$

Physics

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