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Q.

A body is projected from corner A of a hall of length 16 m and height 4 m with velocity u at an angle α with horizontal such that it just touches the roof and hits the other-end B of the floor. Then ‘u’ is equal to

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a

45 m/s

b

10 m/s

c

410 m/s

d

8 m/s

answer is C.

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Detailed Solution

tanα=4HR=4×416⇒α=45oNow, u2sin245o2×10=4⇒u=410 m/s
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