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.

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  

1 cm/sec and 50sec

Explanation:

i got this question on a test and those were the right answers

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

number of electrons for neutral cl