(2a) A 4750.0 kg open train car is rolling on frictionless railsat 24.3 m/s when it starts pouring rain. A few minutes later, thecar's speed is 18.0 m/s. What mass of water has collected in thecar?
(2b) Two 485.0 g blocks of wood are 2.65 m apart on africtionless table. A 23.1 g bullet is fired at 384.5 m/s towardthe blocks. It passes all the way through the first block, thenembeds itself in the second block. The speed of the first blockimmediately afterward is 1.07 m/s. What is the speed of the secondblock after the bullet stops?
(2c) A 2.67 kg sphere makes a perfectly inelastic collision witha second sphere that is initially at rest. The composite systemmoves with a speed equal to one third the original speed of the2.67 kg sphere. What is the mass of the second sphere?
