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+1 vote
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in Physics by (74.9k points)
Two balloons are moving in air with velocities `v_(1)={2thati+(t-2)hatj)m//s` and `v_(2)={(t-4)hati+thatj}m//s` then at what `t` balloons are moving parallel to each other:
A. `5//4s`
B. `4//5s`
C. `10//3s`
D. `-3+-sqrt(17)s`

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