A 12.0 g rifle bullet is fired with a speed of 380 m/s into a ballistic pendulum with mass 9.00 kg, suspended from a cord 70.0 cm long. Compute the vertical height through which the pendulum rises. Answer: In the figure below, Block A has mass 1.00 kg, and block B has mass 3.00 kg. The blocks are forced together, compressing a spring s between them; then the system is released from rest on a level, frietionless surface. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded. Block B acquires a speed of 1.10 m/s. What is the final speed of Block A? 1.00 kg mg = 3.00 kg

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