I need help for physics please

5 mph, 90 meters per hour, 270 cm per hour

Explanation:

1. 5mph

20 x 0.5 = 10 miles

10 miles divided by 2 hours = 5 miles per hour

2.  90 meters per hour

20 minutes is 1/3 of an hour

30 x 3 = 90 meters in an hour

3. 5.5 cm per minute, 270 cm an hour

65-10 = 55 cm

55 / 10 = 5.5

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d