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Q.

A particle is projected from ground with some initial velocity making an angle of 450 with the horizontal. It reaches a height of 7.5 m above the ground while it travels a horizontal distance of 10 m from the point of projection. The initial speed of the projection is

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a

20 m/s

b

5 m/s 

c

40 m/s

d

10 m/s

answer is C.

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Detailed Solution

y=xtanθ-g2u2cos2θx2

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