22. Kerry Klutz drops her physics book off her aunt's high rise balcony. It hits the ground below 1.5 s later.

a. With what speed does it hit?

b. How high is the balcony (ignore air drag).

A). Gravity makes falling objects fall 9.8 m/s faster every second.

After 1.5 seconds, it's falling at (1.5 x 9.8) = 14.7 m/s.

b). The average speed of the physics book is (1/2) (0 + 14.7) = 7.35 m/s.

Falling at an average speed of 7.35 m/s for 1.5 seconds,

the book falls

(1.5 x 7.35) = 11.025 meters