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Net Force F1 = underroot(P2 + 4p2 + 4p2) = underroot(9p2)
F2 = underroot(4p2 + (2p + 20)2 + 4p.(2p+20)) = underroot(16p2 + 160p +400)
Now, F1 = F2
7p2 +160p +400 = 0
P = - 40/28 = -10/7 N
and
P = - 100 N
Where ''-'' minus sign indicates that the force is acting in opposite direction.
plz approve!
20
since the direction of the resultant remains unchanged the angle which it makes with either of the forces remains unchanged.
so we can apply the result of similarity of triangles to get the result. but try to draw the vector triangles yourself.
P/2P = 2P/(2P + 20).
this gives P = 10N.
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