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A disk moving on a frictionless horizont...

A disk moving on a frictionless horizontal table collides elastically y with another identical disk as shown. The directions of motion of the two disks make angles 0 and `phi` with the initial line of motion as shown. Then

A

`0=30^(@)`

B

`0=60^(@)`

C

`phi=30^(@)`

D

`phi=60^(@)`

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The correct Answer is:
A
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