A toy rocket weighing 30 g is launched using a rubber band launcher (no rocket f

Question

A toy rocket weighing 30 g is launched using a rubber band launcher (no rocket fuel) and reaches a maximum height of 20 m (State A). The rocket then falls back freely (no parachutes) to the surface of the Earth. State B is the state of the rocket just before it hits the surface. The standard gravity is 9.8 m middot S^-2 Disregard aerodynamic drag. The following statement is correct: a. In State A, the potential energy of the rocket is at its maximum, and it remains unchanged in State B. b. In State A, the potential energy of the rocket is zero, and in State B the potential energy reaches its maximum value. c. In State A, the kinetic energy of the rocket is zero, and in State B it is at its maximum value. d. In State A, the kinetic energy of the rocket reaches its maximum value, and in State B it is zero. e. In State A, the kinetic energy of the rocket reaches its maximum value, and it remains unchanged in State B. f. In State A, the total energy of the rocket reaches its maximum value, and it drops to zero in State B. g. In State A, the total energy of the rocket is zero, and it rises to its maximum value in State B. h. Since no fuel is burned in raising the rocket to its maximum height, the work performed in this process is zero.

Explanation / Answer

C is correct statement.

In state A, the kinetic energy of the rocket is zero as it is reached to max and now now in state to to come down, so zero kinetic energy. And it has maximum kinetic energy at state B, as it about to touch ground and have max kinetic energy.

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