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Two particles having position vectors `r_(1)=(3hati+5hatj)` metres and `r_(2)=(-5hati-3hatj)` metres are moving with velocities `v_(1)=(4hati+3hatj)m//s` and `v_(2)=(alphahati+7hatj)m//s`. If they collide after 2 seconds, the value of `alpha` is

A

2

B

4

C

6

D

8

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The correct Answer is:
D
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