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[" Two particles having position vector "],[vec r_(1)=(3hat i+5hat j)" metre "andr_(2)=(-5hat 1-3hat j)" metre "],[" are moving with velocities "bar(v)_(1)=(4hat i+3j)m/s],[" and "v_(2)=(alphahat i+7hat j)m/s." If they collide after? "],[" seconds,the value of ' "alpha'" is "],[[" (a) "2," (b) "4],[" (c) "6," (d) "8]]

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