Energy and Momentum: As shown in the figure, a bullet of mass 0.010 kg moving horizontally suddenly strikes a block of wood of mass 1.5 kg that is suspended as a pendulum. The bullet lodges in the wood, and together they swing upward a vertical distance of 0.40 m. The length of the string is 2.0 m. What was the speed of the bullet just before it struck the wooden block?
A. 67 m/s
B. 250 m/s
C. 370 m/s
D. 420 m/s
E. 650 m/s
Answer: D
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