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One object of mass 20 kg is moving with speed $10 m s^{- 1}$ in west direction and another object of mass 10 kg is moving with $15 m s^{- 1}$ in north direction. Both collide and stick together. Choose the correct alternative.

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Their kinetic energy is conserved as it is inelastic collision.

Their kinetic energy is conserved as it is elastic collision.

Their momentum is conserved as it is inelastic collision.

Their momentum is conserved as it is elastic collision.

answer is C.

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Detailed Solution

In all collisions the momentum is conserved, as the velocity of separation is zero this is an inelastic collision.

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