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The unit of impulse is_____.

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Important Questions on Centre of Mass, Momentum and Collisions

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A smooth sphere A is moving on a frictionless horizontal plane with angular speed ω and centre-of- mass velocity v. It collides elastically and head-on with an identical sphere B at rest. Neglect friction everywhere. After collision, their angular speeds are ωA and ωB 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 A of mass m rolls without sliding on a smooth horizontal surface. It collides elastically and head-on with another stationary smooth solid sphere B of the same mass m and same radius. The ratio of the kinetic energy of B to that of A just after the collision is

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A body has its centre of mass at the origin. The x-coordinates of the particles,
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All the particles of a body are situated at a distance R 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 m and MM>m?
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Two homogeneous spheres A and B of masses m and 2m having radii 2a and a, respectively, are placed such that they touch each other. The distance of the centre of mass from the centre of first sphere is