A shell fired from the ground is just able to cross in a horizontal direction the top of a wall 90 m away and 45 m high. The velocity of the shell will be

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42 ms-1

52 ms-1

32 ms-1

62 ms-1

answer is A.

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Detailed Solution

45 = R = = u2sin24502×9.8or u = 42 ms-1

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