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Find unit vector in direction of frictio...

Find unit vector in direction of friction force acting on block, given `vecV _(p) = 7 hati - 2 hatj' vecV _(b) = 3 hati + hatj`

A

`(-4)/(5) hati + (3)/(5) hatj `

B

`(4)/(5) hati - (3)/(5) hatj`

C

`4/5 hati + (3)/(5) hatj`

D

`4 hatj`

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The correct Answer is:
B
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