An auto moves 10 meters in the first second of travel,10 more meters in
the next second,and 10 meters during the third second.The acceleration of the
auto in m/s2 is
一辆汽车第一秒移动了10m,下一秒又移动了10m,在第三秒移动了10m.
这辆汽车的加速度是多少m/s2?