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A particle of mass is projected with a speed from the ground at an angle with respect to horizontal (-axis ). When it has reached its maximum height, it collides completely inelastically with another particle of the same mass and velocity . The horizontal distance covered by the combined mass before reaching the ground is,
(a)
(b)
(c)
(d)

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

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