試題詳解

1. A particle moves in a track and its speed are recorded and plotted in
the figure. Which statement is correct?

(A) It is stationary from t=0.0 to t=0.5 second.
(B) It has maximum acceleration at t=1.5 seconds.
(C) No external force acting on the particle at t＞2.5 seconds.
(D) The maximum force received by this particle is at t=1.5 seconds.

(E) This particle received a constant force against its motion during 1.0 to 2.0 seconds.