What is the final velocity of the combined bumper cars
a 225 kg red bumper car is moving at 3.0 m/s. it hits a
stationary 180 kg blue bumper car. the red and blue bumper
cars combine and hit a stationary green bumper car of mass
150 kg. the red, blue, and green bumper cars all combine.
0.93 m/s
1.2 m/s
1. don's
2.7 m/s

B) 1.2 m/s

Explanation:

Collision 1

Mr Ur + Mb Ub = (Mr+Mb) V

225 × 3 + 0 = (225 + 180 ) V

V = 675/ 405

1.67 kg.m/s

Collision 2

(Mr+Mb) V + Mg Ug = (Mr+Mb+Mg) V'

675 + 0 = 555 V'

V' = 1.2 m/s

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.

-4 on