試題詳解

32. A force acting on an object moving along the x axis is given by Fx = (14x − 3x² ) N, where x is in m. How much work is done by this force as the object moves from x = −1 m to x = +2 m?
(A) +12 J
(B) +28 J
(C) +40 J
(D) +42 J
(E) −28 J