If a ball with an original velocity of 0 is dropped from a tall structure and takes 7 seconds to hit the ground what velocity does the ball have when it reaches the ground a. 156.8 b. 240.1 c. 68.6 d. 34.3

Gravity adds 9.8 m/s to the downward speed of a falling object every second. (On Earth.)

In 7 seconds, gravity adds (7 x 9.8 m/s) = 68.6 m/s to the downward speed of a falling object.

(IF air resistance has no effect on the object.)

true

explanation:

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures