You and your friend are on ground completely covered with ice with a certain distance apart. Now you throw a ball towards your friend, he catches it and throw back towards you and you catch it and so on. What happens to the distance between you and your friend? (neglect resistance due to ice)

the distance increases

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the distance remains constant

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the distance decreases

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cannot be decided about the distance unless we know their masses

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Solution

The correct option is B the distance remains constant
The distance remains constant because the momentum of total system is conserved and there is no net external force, because friction due to ice is $0$ and initial velocity is also $0$ .

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You and your friend are on ground completely covered with ice with a certain distance apart. Now you throw a ball towards your friend, he catches it and throw back towards you and you catch it and so on. What happens to the distance between you and your friend? (neglect resistance due to ice)

The correct option is B the distance remains constantThe distance remains constant because the momentum of total system is conserved and there is no net external force, because friction due to ice is 0 and initial velocity is also 0.

The correct option is B the distance remains constant
The distance remains constant because the momentum of total system is conserved and there is no net external force, because friction due to ice is $0$ and initial velocity is also $0$ .