物体在竖直方向上△y=gT2,则T=
=
△y g
=0.1s.
(0.4m?0.15m)?0.15m 10m/s2
物体在水平方向的速度,即物体的初速度v0=
=xAB T
1.0m/s.0.1m 0.1s
B点竖直方向上的分速度为vBy=
=yOC 2T
=2m/s,0.4m 2×0.1s
物体运动到B点的速度vB=
=
+
v
v
m/s=
12+22
m/s;
5
故答案为:1.0;