1.

If two forces are acting at a point such that the magnitude of each force is 2N and the magnitude of their resultant is also 2N, then the angle between the two forces is

Answer»

<P>`120^(@)`
`60^(@)`
`90^(@)`
`0^(@)`

Solution :`P=Q 2N, R=2N`
`R^(2)=P^(2)+Q^(2)=2PQ Cos THETA`
`4=4+4+2(4)+Cos theta`
`cos theta=(-4)/(8)=(-1)/(2), theta=120^@`


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