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A car is going in south with a speed of ...

A car is going in south with a speed of `5m//s`. To a man sitting in car a bus appears to move towards west with a speed of `2sqrt(6)m//s`. What is the actual speed of the bus?

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The correct Answer is:
7
`v_(b)=-5 hatj v_(c//b b)=-2sqrt(6hati)v_(0)=-2sqrt(6hati)+-5hat j`
`|bar a xx barb|` units
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