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If vector P, Q and R have magnitude 5,12...

If vector `P, Q and R` have magnitude 5,12,and 13 units and `vec(P)+vec(Q)=vec(R )`, the angle between Q and R is

A

`cos^(-1)(5)/(12)`

B

`cos^(-1)(5)/(13)`

C

`cos^(-1)(12)/(13)`

D

`cos^(-1)(7)/(13)`

Text Solution

Verified by Experts

The correct Answer is:
C

`|vecP|=5,|vecQ|=12 and |vecR|=13`
`costheta=(Q)/(R )=(12)/(13)`
`theta=cos^(-1)((12)/(13))`
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