A 60g tennis ball moving with a speed of 7 m/s hits a wall at an angle of 55 ∘ with the wall. It bounces off the wall with the same speed at the same angle (but not directly backwards).

If the ball was in contact with the wall for 0.002s, what was the magnitude of the average force exerted by the wall on the ball?

correct it is c.) b b

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.

compass can be used day and night, cloudy or sunny

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.