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Q.

When a ball hits a floor and rebounds after an inelastic collision,

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a

the momentum of the ball just before collision is equal to its momentum just after the collision

b

the total mechanical energy of the ball just before collision is equal to its total mechanical energy  after the collision

c

the momentum of the ball and earth is conserved

d

all the above are true

answer is C.

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Detailed Solution

all 3 types of collision linear momentum of the system ( ball and earth) is conserved. In inelastic collisions, mechananical energy is converted into other forms of  energy.
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When a ball hits a floor and rebounds after an inelastic collision,