試題詳解

13. A 1.2 kg croquet ball moving at t2.0 m/s is struck from bebind by the impulse force shown in Figure 7. What is the final velocity of the croquet ball?
(A) 0.3 m s^-1,
(B) 10.3 m s^-1,
(C) 20.3 m s^-1,
(D) 30.3 m s^-1,
(E) 40.3 m s^-1,