A swimmer swims faster and increases from 80.1 m/s to 80.3 m/s during the last 20 seconds. What is his acceleration?

(BTW this is a Physics question) 0.01 m/s^2.

Explanation: The formula for acceleration is Δ velocity/ Δ time or change in velocity/change in time. We can see find the change in velocity by subtracting v0 (initial velocity) from v (current velocity). v - v0 = 80.3 m/s - 80.1 m/s = 0.2 m/s. The change in time is already given, 20 seconds, so all you have to do is divide 0.2 m/s by 20 seconds to get 0.01 m/s^2.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

elements make up everything, and they combine to make compounds.

the answer is c