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Two forces P and 2P are acting at an ang...

Two forces P and 2P are acting at an angle `theta`. If thesquare of the resultant of them is equal to half of the sum of the squares of their magnitude then `theta` is

A

`sin^(-1) ((5)/(8))`

B

`cos^(-1) ((-5)/(8))`

C

`cos^(-1) ((8)/(5))`

D

`0^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
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