Suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. whats its speed (in m/s) of the object after falling 2 seconds?

19.6 m/s

Explanation:

If we take down to be positive, the acceleration due to gravity is 9.8 m/s².

Acceleration = change in velocity / change in time

a = Δv / Δt

9.8 m/s² = (v - 0 m/s) / 2 s

v = 19.6 m/s

The speed after 2 seconds is 19.6 m/s.