A.
B.
C.
D.
参考答案:
C
本题详细解析:
Explanation:
Even though the instantaneous speed of the body is unknown, average speeds for each interval can be compared by using the distances covered for the same time interval. Initially, its average speed increases then stay constant and finally decreases. Also, the object does not change direction, therefore it does not have negative velocity. The only graph that satisfies these conditions is C.
