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Q.

A body thrown horizontally from the top of tower strikes the ground after three seconds at an angle 45° with the horizontal. The speed with which the body was projected

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a

9.8 ms–1

b

19.6 ms–1

c

29.4 ms–1

d

32.4 ms–1

answer is C.

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Detailed Solution

∵tan⁡θ=VyVx⇒1=VyVx∵θ=45∘⇒u=gt=9.8×3=29.4ms−1
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