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At a given instant of time two particles...

At a given instant of time two particles are having the position vectors `4 hati -4hatj + 7 hatk` metre and `2 hat i +2 hatj + 5hatk` respectively. If the velocity of the first particle be `0.4 hati ms^-1`, the velocity of second particle in metre per second if they collide after 10 s is

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