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A projectile is fired at with momentum , neglecting friction, the change in kinetic energy, when it returns to the ground, will be:-
(a)zero
(b)
(c)
(d)

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Important Questions on Centre of Mass, Momentum and Collisions
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Three identical spheres each of mass are placed touching one another with their centres in a straight line. Their centres are marked as respectively. The distance of centre of mass of the system from is

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A uniform metal disc of radius R is taken and out of it a disc of diameter is cut off from the end. The centre of mass of the remaining part will be:

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The coordinate of the centre of mass of a system as shown in figure :-

HARD
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The centre of mass of a system of particles does not depend on

MEDIUM
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The centre of mass of a system of two particles divides the distance between them:

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The centre of mass of a body,

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Three identical metal balls, each of radius are placed touching each other on a horizontal surface such that an equilateral triangle is formed when the centres of the three balls are joined. The centre of mass of the system is located at

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A system consists of mass and . The centre of mass of the system is:
