If a runner decreases his velocity from 0m/s to +20m/s in 2.0s, what is was his average acceleration?

-10 m/s²

Explanation:

Average acceleration is change in velocity over change in time.

a = (v − v₀) / (t − t₀)

a = (0 m/s − 20 m/s) / (2 s − 0 s)

a = -10 m/s²

volume: 22

density: 7.04

b

explanation:

bc its just b