$A$ ball hits the floor and rebounds after an inelastic collision. In this case:

  • A
    The momentum of the ball just after the collision is the same as that just before the collision.
  • B
    The mechanical energy of the ball remains the same in the collision.
  • C
    The total momentum of the ball and the earth is conserved.
  • D
    The total energy of the ball and the earth is conserved.

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Two bodies having same mass $40\, kg$ are moving in opposite directions,one with a velocity of $10\, m/s$ and the other with $7\, m/s$. If they collide and move as one body,the velocity of the combination is ........ $m/s$.

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