What is the average speed of an object falling towards ground from rest after 4 seconds?

Explanation

To calculate the average speed, you need to have a total distance and a total time and divide the total distance by that time.

We already know the time, it is t = 4 sec

We need to calculate the distance using this equation for falling objects

d = v₀t + ½ at²

v₀ = 0 since object is falling from rest, and a = 9.8 m/s² (gravity acceleration)

d = ½ (9.8)(4)² = 78.4 m

The average speed would be = 78.4 / 4 = 19.6 m/s