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The angle between two vectors vec P and ...

The angle between two vectors `vec P and vec Q` of magnitudes 3 and 5 units is `60^(@)`. What is the dot product of the two vectors ?

A

6.5

B

7.5

C

8.5

D

3.5

Text Solution

Verified by Experts

The correct Answer is:
B
`vec P cdot vec Q = PQ cos theta =3xx5xx cos 60^(@) =15 xx(1)/(2)=7.5`
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