题目列表(包括答案和解析)
质点做直线运动,其位移随时间变化的函数关系是:s = 4t-2t2(式中s的单位为m ,t的单位为s),则该质点运动的初速度v0和加速度a分别是
A.v0 = 2m/s,a =﹣4m/s2 | B.v0 =" 4m/s" ,a =﹣2m/s2 |
C.v0 =" 4m/s" ,a = 4m/s2 | D.v0 =" 4m/s" ,a =﹣4m/s2 |
质点做直线运动,其位移随时间变化的函数关系是:s = 4t-2t2(式中s的单位为m ,t的单位为s),则该质点运动的初速度v0和加速度a分别是
A.v0 = 2m/s,a =﹣4m/s2 B.v0 =" 4m/s" ,a =﹣2m/s2
C.v0 =" 4m/s" ,a = 4m/s2 D.v0 =" 4m/s" ,a =﹣4m/s2
A.v0=0,a=4m/s2 | B.v0=4m/s,a=2m/s2 |
C.v0=4m/s,a=1m/s2 | D.v0=4m/s,a=4m/s2 |
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