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Q.

Rain clouds can be as high as 1 km above the ground. If a rain drop falls freely under gravity from that height then what will be its speed in kmh−1 on striking the ground? (Take g=10ms−2

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a

510

b

610

c

710

d

910

answer is A.

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Detailed Solution

Here, u=0,g=10ms−2,h= 1 km = 1000 mAs v2−u2=2gh∴v2=2ghor v=2gh=2×10×1000 =1002ms−1=1002×185kmh−1=3602kmh−1≈510kmh−1
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