Fill in the blank for a school project, robert records the motion of a snail and plots a position-time graph of the data. from the graph, the speed of the snail in the first 20 seconds is centimeter/second. after that, the snail remains in the same place for seconds.

From the graph, the speed of the snail in the first 20 seconds is

1  centimeter/second.

After that, the snail remains in the same place for 50  seconds.

Explanation:

As we know  

Speed= distance covered / unit time

So putting the values in the above equation we get

Speed= 20 cm/20 sec

Speed= 1 cm/s ec

After that the snail remained still for 50 cm because the line is straight from 20 seconds to 70 seconds as the distance is not changing as shown in the graph so 70 sec -50 sec= 20 sec  

B. convex since the words are bigger

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.