Question

以10m/s的速度将质量为m的物体从地面竖直向上抛出,若忽略空气阻力,（g取10m/s2)

Answer 1

1,运动学解法

h=V^2/2g

=100/20

=5m

2,

mV^2/2=2mgh

h=V^2/4g

=100/40

=2.5m