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Q.

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=5T2? (Take g=10ms−2

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a

30∘

b

45∘

c

60∘

d

90∘

answer is B.

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Detailed Solution

RT2=gsin⁡2θ4sin2⁡θ=g2cot⁡θ=5cot⁡θ Given RT2=5; Hence ,5=5cot⁡θ  or  θ=45∘
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