試卷名稱:111年 - 111 國立中山大學_學士後醫學系招生考試:物理及化學#113520
年份:111年
科目:學士後西醫物理及化學
6.A 3.0-kg mass is projected down a rough, circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 4.0 m/s, and at point B, it is 7.0 m/s. What is the change in mechanical energy
done on the system between A and B by the force of friction?

(A) -24 J
(B) -9.3 J
(C) -8.1 J
(D) -7.2 J
(E) -6.6 J