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Question

If x=at2,y=2at then d2ydx2=

A
1t2
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B
12at3
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C
1t3
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D
12at3
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Solution

The correct option is D 12at3
x=at2,y=2at
dxdt=2at,dydt=2a
dydx=1t
(d2ydx2)=1t2dtdx
=1t2×2at
=12at3

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