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Question

An aeroplane flying horizontally at an altitude of $$490m$$ with a speed of $$180kmph$$ drops a bomb. The horizontal distance at which it hits the ground is


A
500m
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B
1000m
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C
250m
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D
50m
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Solution

The correct option is A $$500m$$
Given :   $$h = 490 \ m$$
Horizontal velocity   $$u = 180 \ km/h = 180\times \dfrac{5}{18} = 50 \ m/s$$
Time of flight  $$T = \sqrt{\dfrac{2h}{g}} = \sqrt{\dfrac{2\times 490}{9.8}} = 10 \ s$$
Horizontal distance  $$R = uT  = 50\times 10 = 500 \ m$$

Physics

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