Physics speed and velocity

Question

A person runs 40 m in 4.5 seconds and stops for two seconds. Then the person runs another 35 m in 4.0 seconds. What is the average speed of the person. Use GUESS steps to show your work.

Answer 1

Givens: x = 40 + 35 meters, t = 4.5 + 2 + 4.0 seconds

Unknown: Average Speed

Equation: V_AVG = Δx/Δt

Substitute: V_AVG = (40 + 35)/(4.5 + 2 + 4.0)

Solve: V_AVG = 7.142857 meters/second

Sig Figs = 1 so we round our answer to 7 m/s