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July 28, 2014

Homework Help: physics

Posted by help on Sunday, November 21, 2010 at 10:53pm.

The force F = (3.2, -7.1) N acts on a mass of 1.15 kg. At time t = 0 s, the mass has a velocity v0 = (-0.46, 0.36) m/s.

What is the angle (in degrees) of the initial velocity, measured counter-clockwise from the +x-axis?
I got 38.04 degrees but isn't the right answer

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