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To the end of a 50 cm long rope, a ball of 100 g, which is...

To the end of a 50 cm long rope, a ball of 100 g, which is swinging under a vertical circle, is attached under the influence of gravity. When the rope makes an angle theta = 12 ° with the ball, the ball has a speed of 2.2 m / s.
a) Find the current Radial component (ar) of acceleration
b) Find the magnitude of the tangential acceleration (at) when theta = 18 °.
c) Find the magnitude of the total acceleration when theta = 18 °.
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