7. Mechanical energy... [Choose all correct options. Multiple choices may be correct. Enter your answer as a string, so if you believe A, B, and D to be correct, enter 'ABD'.] A) is a new form of energy, different than kinetic or potential energy. B) increases when a system is deformed from its stable equilibrium. C) is kinetic energy plus potential energy. D) stays constant if the system is isolated and elastic. Answer: Submit All Answers 13. A pair of carts, both of mass 1.1 kg are initially at rest. Between them, a spring of stiffness 35 J/cm² is squeezed with s = -2 cm. When the system is released, the spring stretches back to its equilibrium length and the carts fly off in opposite directions. Use 'Before and After' analysis to find the speeds of the carts after they are pushed apart. Answer: Submit All Answers

7. Mechanical energy... [Choose all correct options. Multiple choices may be correct. Enter your answer as a string, so if you believe A, B, and D to be correct, enter 'ABD'.] A) is a new form of energy, different than kinetic or potential energy. B) increases when a system is deformed from its stable equilibrium. C) is kinetic energy plus potential energy. D) stays constant if the system is isolated and elastic. Answer: Submit All Answers 13. A pair of carts, both of mass 1.1 kg are initially at rest. Between them, a spring of stiffness 35 J/cm² is squeezed with s = -2 cm. When the system is released, the spring stretches back to its equilibrium length and the carts fly off in opposite directions. Use 'Before and After' analysis to find the speeds of the carts after they are pushed apart. Answer: Submit All Answers