Lillian (mass 40.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 2.0 m/s.What
问题描述：
Lillian (mass 40.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 2.0 m/s.What is the speed of Lilian and her dog after the catch?
答
李连(重40kg)站在很光滑的冰面上,他的狗以2.0m/s的速度向他滑来,问他接住他的狗后,他们的速度是多少?
将李连和他的狗看作一个系统,在水平方向没有任何外力作用,应用动量守恒,设接住狗之后,他们的速度为am/s
则15*2=(40+15)a
a=6/11 m/s