An A 0.083 kg tennis ball is dropped from rest, a height of 1.5 m above the surface of a bathroom scale. It bounces off the scale and returns to a final height of 1.2 m above the surface of the scale before stopping again. The scale measures the upward normal force on the tennis ball in Newtons, as shown in the plot. What is Δt, the duration of the collision of the tennis ball with the scale?
 

n, (N) 36 0 1 (S)