试题与答案

(10分) 有一个质点沿x轴做单向运动,质点在各个时刻的位置坐标如下表: t/s

题型:计算题

题目:

(10分) 有一个质点沿x轴做单向运动,质点在各个时刻的位置坐标如下表:

t/s0123456789
x/m24688812172024
求:

(1)质点在前5s内的位移;

(2)质点在第6s内的路程.

答案:

(1)6m;(2)4m.

题目分析:

(1)计时时刻位置坐标x1=2m

5s时位置坐标位置x2=8m

位移∆x1=6cm

(2)物体在第5s时末位置坐标为x3=12m

物体在第6s时末位置坐标为x4=16m

位移∆x2 =x4-x3=4cm

物体做单向直线运动,所以路程也为4m。

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