試題詳解

2. A force acting on an object moving along the x axis is given by F_x = (16x - 3.0x²) 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) +40J,
(B) +12 J,
(C)+15J,
(D) +42 J,
(E)-28 J.