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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

a
42 ms-1
b
52 ms-1
c
32 ms-1
d
62 ms-1

detailed solution

Correct option is A

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

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