試題詳解

2. A 0.30 kg rocket in a fireworks display is launched from rest and follows an erratic flight (飛行不穩定) path to reach point P, which is 35 m above the starting point. During the flight, 600 J of work is done on the rocket by the non-conservative force generated by the burning propellant (燃燒推進劑). Ignoring air resistance and the mass lost due to the burning propellant, find the speed of the rocket at point P. (g =9.8 m/s²)
(A) 51.97 m/s
(B) 53.16 m/s
(C) 55.29 m/s
(D) 57.56 m/s
(E) 59.42 m/s