The best and most common way to measure the intensity of a cardiovascular exercise is to determine O The person's heart rate
O The fatigue level of the person
O Amount of perspiration the person produces
The person's breathing rate

the person's heart rate

6/12=1/2

step-by-step explanation:

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.