Two particles are moving along the x axis. particle 1 has a mass m1 and a velocity v1 = +3.2 m/s. particle 2 has a mass m2 and a velocity v2 = -7.1 m/s. the velocity of the center of mass of these two particles is zero. in other words, the center of mass of the particles remains stationary, even though each particle is moving. find the ratio m1/m2 of the masses of the particles.

0.4570

Explanation:

Our values are,

The center of mass velocity is the sum of each mass's momentum divided by the total mass of the system.

This equation is given by,

We know from the statment that center of mass of these two particles is zero, so

Re-arrange to find the ratio,

Substituting,

Therefore our ratio is 0.4570.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.