f^2 + 2f = f (f + 2)
2f + 8 = 103 2f = 95 f = 47.5
the resultant magnitude is 2 times the magnitude of F as the two forces are equal, Resultant R= F + F = 2F and the magnitude of 2F is 2F.
Well, isn't that a lovely puzzle we have here! Let's paint a happy little picture to solve it. If we let the son's current age be "S," then the father's current age would be "3S." After 15 years, the father will be "3S + 15" and the son will be "S + 15." Since the father will be twice as old as the son at that time, we can set up the equation "3S + 15 = 2(S + 15)" and solve for S. Happy solving!
2f! :/
2f + 8 = 102 Subtract 8 from both sides: 2f = 94 Divide both sides by 2: f = 47
2f
face to face
2f
2f
2f-6=4 2f-6=4 (add 6 to both sides) +6 +6 2f=10 (divide by 2) -- --- 2 2 f=5 (the 2s cancel out and 10/2 is 5)
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