Finding Velocity

Question

A raindrop falls to the ground from the height 's' meters. After 't' seconds the raindrop is 's' meters above the ground where s(t)= 120 - 2t^2. Find the average velocity between 3 seconds and 4 seconds

Answer 1

The average velocity is just the slope of the line connecting the points (3, s(3)) and (4, s(4)):

 

V_avg = (s(4)-s(3)) / (4-3)