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Energy supplied to the rotational energy

A 1.2-kg 10-cm-diameter solid sphere is rotating about its diameter at 69 rev/min.

(a) What is its kinetic energy?

(b) If an additional 5.0 mJ of energy are supplied to the rotational energy, what is the new angular speed of the ball?

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## Q : Calculate the magnitude of the initial velocity

One gives the craft an acceleration in the x direction of ax = 5.13 m/s2, while the other produces an acceleration in the y direction of ay = 7.28 m/s2. At the end of the firing period, the craft has velocity components of vx = 3716 m/s and vy = 4