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The unit of impulse is_____.
(a)
(b)
(c)
(d)

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Important Questions on Centre of Mass, Momentum and Collisions
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A smooth sphere is moving on a frictionless horizontal plane with angular speed and centre-of- mass velocity . It collides elastically and head-on with an identical sphere at rest. Neglect friction everywhere. After collision, their angular speeds are and respectively. Then:

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A solid sphere, a hollow sphere and a ring are released from the top of an inclined plane (frictionless) so that they slide down the plane. Then, maximum acceleration down the plane is for (no rolling)

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A hollow smooth uniform sphere of mass rolls without sliding on a smooth horizontal surface. It collides elastically and head-on with another stationary smooth solid sphere of the same mass and same radius. The ratio of the kinetic energy of to that of just after the collision is

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The centre of mass of a body

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A body has its centre of mass at the origin. The -coordinates of the particles,

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All the particles of a body are situated at a distance from the origin. The distance of the centre of mass of the body from the origin is

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Where will be the centre of mass on combining two masses and ?

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Two homogeneous spheres and of masses and having radii and respectively, are placed such that they touch each other. The distance of the centre of mass from the centre of first sphere is
