Question

4. The elevation at ground level is 0 feet. An elevator starts 80 feet below ground level. After

traveling for 20 seconds, the elevator is 30 feet below ground level. Which statement describes
the elevator's rate of change in elevation during this 20-second interval?
A. The elevator traveled upward at a rate
1 rate of 2½ feet per second.
B. The elevator traveled downward at a rate of 2 feet per second.
C. The elevator traveled upward at a rate of 4 feet per second.
D. The elevator traveled downward at a rate of 4 feet per second.
a

Answer 1

`m = ( - 30 - ( - 80))/(20 - 0) = (50)/(20) = 2 (1)/(2)`

A. The elevator traveled upward at a rate of 2 1/2 feet per second. -30 > -80.