急急急!!求高中物理题一道

2024-12-14 06:12:47
推荐回答(4个)
回答1:

设向右为正方向,由于是光滑表面,即不存在摩擦
所以动量守恒:小车的动量+人的动量=后来一起共速的动量
要注意方向
即100×1+50×(-5.6)=(100+50)*V共同速度
解得V共同速度=-1.2m/s
算出的负数代表与原来所设方向相反,
所以大小为1.2m/s 方向向左

回答2:

100*1-50*5.6=150*X
X=1.2
人跳上车后的共同速度为1.2米每秒 方向向左

回答3:

设向右为正方向,由于是光滑表面
所以动量守恒
小车的动量=100×1
人的动量=50×(-5.6)
则最后总动量为=100×1+50×(-5.6)=-180
则最后的速度为=-180/(100+50)=-1.2m/s
所以大小为1.2m/s 方向向左

回答4:

此题可用动量定理
以向右为正方向,则有
m*1-M*5.6等于(m+M)v
解得 v等于-1.2
所以 人和车共同速度为1.2米每秒,方向向左

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