[单选题]
A car is moving on a horizontal road. The
19 nb,vki8h qxvariation of
5i cxts 7lr)* 2kcba.m velocity v of a car with time t can be seen i
)b ks c5xm. iacr7t2*ln the graph below.
Which of the following graphs shows the variation of displacement s of the car with time t?
A.
B.
C.
D.
参考答案:
C
本题详细解析:
Explanation:
The velocity-time graph shows that the car moves in the positive direction for half of the time, and then in the negative direction for the second half of the motion. The gradient of a displacement-time graph at any point is the velocity. Therefore, the displacement-time graph that matches this motion will have a positive gradient for the first half of the motion and a negative gradient for the second half of the motion. The only graph correctly shows this is C.
