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Which of the following is not a projectile?
(a)An aircraft taking off
(b)A bullet fired from a rifle
(c)A ball thrown horizontally from a roof
(d)A football kicked by a player

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Important Questions on Motion in a Plane
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The projectile motion of a particle of mass is shown in the figure.
The initial velocity of the particle is and the air resistance is assumed to be negligible. The magnitude of the change in momentum between the points and is . The value of , to the nearest integer, is ___ .

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