2. An ice hockey goalie catches a hockey puck and recoils backward. The goalie has a mass
of 70 kg and is initially at rest. The puck has a mass of 0.15 kg and is moving toward the
goalie at a velocity of 35 m/s. What is the recoil velocity (backwards movement) of the
goalie after he catches the puck?

it should be -8.6 cm hope this out

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.

the answer is 12 as i may remember

: )

snell's law

refractve index = sin incidence / sin refraction