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Two small spheres of equal mass, and hea...

Two small spheres of equal mass, and heading towards each other with equal speeds, undergo a head on collision `(` external force acts on system of two spheres `)`. Then which of the following statement is correct ?

A

They will exchange velocities.

B

Their velocities will be zero.

C

Their velocities will be reduced.

D

Their velocities may be zero.

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The correct Answer is:
D
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