Three forces 
, 
and 
are acting on a body as shown in figure
Given F 1 = 10 N, F 2 = 10 
N and F 3 = 20 N
(i) External force required to keep block at rest is (in newton)-
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Ans.
(i)
Sol. 
(ii)
Sol. 20 newton in x-direction
(iii)
Sol. 40 newton at angle 120º with x-axis
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