标题: Physics Questions 帮帮忙 [打印本页] 作者: ws0146 时间: 2013-7-8 08:28 PM 标题: Physics Questions 帮帮忙 1.Salina is driving a velocity of 10 m/s.Seeing a cow in front.She brakes to stop her car.If the deceleration of the car is 2 m/s.What is the distance the car covers before it comes to a halt?
2.A grenade suddenly explodes and turns into two parts which travel to opposite direction.The mass of first part is three times of mass of second part.If the velocity of the first part is V1.What is thevelocity of the second part in terms of V2 ?作者: chungwei0730 时间: 2013-7-8 09:11 PM
1） v^2 = u^2+2 as
V =0 u=10 a=-2
2)0=3mv+m3v
V2=-v1 ?
第二个可能有问题作者: ws0146 时间: 2013-7-8 09:29 PM
chungwei0730 发表于 2013-7-8 09:11 PM
1） v^2 = u^2+2 as
V =0 u=10 a=-2
