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2014-08-05T04:34:02+05:30

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Use the formula
R² = P² + Q² + 2 P Q cos Ф
 = 30² + 40² + 2 30 40 cos 60
 = 900 + 1600 + 2400 * 1/2
  = 3700
R = 10 √37 Newtons
 angle of  the resultant force with 30 N force is
     tan α = Q sin Ф  /  (P + Q cos Ф)
             = 40 √3 / 2 (30+40*1/2)  = 2√3 / 5
     α = inverse tan  (2√3/5) = 34.7 degrees

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