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A particle is projected from the surface of the earth with a velocity of at an angle with the horizontal. Another particle is projected on the surface of some other planet with a velocity of at the same angle and it follows a trajectory which is identical to the trajectory of the projectile which is fired on earth. The value of the acceleration due to gravity on that planet is [given that the acceleration due to gravity on the surface of earth, ]
(a)
(b)
(c)
(d)

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Important Questions on Motion in a Plane
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The velocity of a projectile at the initial point is . Its velocity (in ) at point is

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