Block A has a mass of 3 kg and Block B has a mass of 5 kg.Just before colliding,Block A has a speed of 4 m/s and Block B is at rest(0m/s).After the collision,Block B has a speed of 3m/s in the same direction that Block A was initially.What is the spe

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Block A has a mass of 3 kg and Block B has a mass of 5 kg.Just before colliding,Block A has a speed of 4 m/s and Block B is at rest(0m/s).After the collision,Block B has a speed of 3m/s in the same direction that Block A was initially.What is the spe
Block A has a mass of 3 kg and Block B has a mass of 5 kg.Just before colliding,Block A has a speed of 4 m/s and Block B is at rest(0m/s).After the collision,Block B has a speed of 3m/s in the same direction that Block A was initially.What is the speed of Block You may notice you get a negative answer.What does that mean?

Block A has a mass of 3 kg and Block B has a mass of 5 kg.Just before colliding,Block A has a speed of 4 m/s and Block B is at rest(0m/s).After the collision,Block B has a speed of 3m/s in the same direction that Block A was initially.What is the spe
物体A质量为3kg,物体B质量为5kg,碰撞之前物体A速度为4 m/s,物体B此时静止.碰撞后,B物体具有与A物体初始速度方向相同的速度,其大小为3m/s,求此时A的速度?你会得到一个负数答案,那意味着什么呢?
假设A的速度为x m/s,方向与初始速度方向一致
根据动量守恒,则有 3*4 = 3x + 5*3
解得 x= -1 即此时A的速度为1m/s,方向与初始速度方向相反
注意：这时候两个物体的动能 0.5*5*3^2 + 0.5*3*1^2 = 0.5*48 =24
而A的初始动能 0.5*3*4^2 = 0.5*48 =24
这意味着物体A与B发生了完全弹性碰撞,能量没有损失

Block A has a mass of 3 kg and Block B has a mass of 5 kg.Just before colliding,Block A has a speed of 4 m/s and Block B is at rest(0m/s).After the collision,Block B has a speed of 3m/s in the same direction that Block A was initially.What is the spe a mass a mass blind block a vote 第二道!紧急A block of mass m = 2.0 kg is held in equilibrium on an incline of angle θ = 60° by the horizontal force FDetermine the normal force exerted by the incline on the block A bullet of mass m traveling at velocity v strikes a lock of mass 2m that is attached to a rod of length R.The bellet collides with the block at a right angle and gets stuck in the block.The rod is free to rotate.What is the centripetal acceleration a tall block的意思 一道英文的物理题,急（关于energy）A simple pendulum of length 2.00 m is made with a mass of 2.00 kg.The mass has a speed of 3.00 m/s when the pendulum is 30.0o above its lowest position.What is the maximum angle away from the lowest posit the mass of 与 a mass of 有啥区别? A compound is 54.53% C,9.15% H,and 36.32% O by mass.What is its empirical a{display:block;}中display:block;是什么意思,有什么作用 wooden block是什么意思原句是：put ink on a wooden block mass的用法the mass of 和 a mass of 有什么区别？ a sample of gas has a density of 1.96g/l at STP.Determine its molar mass. 7.As shown above,a ball of mass m,suspended on the end of a wire,is released from height h and collideselastically,when it is at its lowest point,with a block of mass 2m at rest ona frictionless surface.After the collision,the ball rises to a final h if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the接上relative mass and charge of :1.a neutron2.an electron? A highly volatile substance initially has a mass of 1200g and its mass is reduced by 12% each second.Q1.Write a formula that gives the mass of the substance(m) at time(t) seconds.Q2.Rearrange this formula to make t the subject.Q3.What mass remains af his room isi in a mass是什么