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At what angle with the horizontal should...

At what angle with the horizontal should a ball be thrown so that the range R is related to the time of flight as `R= 5 T^2` ? (take `g= 10 ms^(-2)` )

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The correct Answer is:
D
`t=u/g" cosec "theta`
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VMC MODULES ENGLISH-Motion in Two Dimensions-Level -1
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