A bullet of mass 149 g and a speed v passes completely through a pendulum of mass 6.15 kg and length 57 cm. The bullet emerges with a speed that has been reduced by 1/2 of its original value. The pendulum then travels in a full and perfect circle. (a) If the pendulum is suspended by a light, stiff rod, what is the minimum speed of the bullet? (b) If the pendulum is suspended by a string, what is the minimum speed of the bullet?