The ball A of mass 10 kg is attached to the light rod of length l = 0.8 m. The mass of the carriage alone is 250 kg, and it moves with an acceleration a_O as shown. If θ˙ = 3 rad/s when θ = 90°, fi nd the kinetic energy T of the system if the carriage has a velocity of 0.8 m/s 

(a) In the direction of a_O 

(b) In the direction opposite to a_O. Treat the ball as a particle.

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A do