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Question

An aeroplane is moving with a horizontal velocity u at a height h above the ground. If a packet is dropped from it the speed of packet when it reaches the ground will be

A
(u2+2gh)1/2
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B
(2gh)1/2
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C
(u22gh)1/2
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D
2gh
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Solution

The correct option is A (u2+2gh)1/2
Lets consider u= initial velocity
h=height
g= acceleration due to gravity
v= speed at the ground
From 3rd equation of motion,
v2=u2+2gh
v=u2+2gh
v=(u2+2gh)1/2
The correct option is A.

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