Disregarding air resistance, what is the speed of a ball dropped from 12 feet just before it hits the ground? (use 1 ft = 0.30
m, and use g = 9.8 m/s2)
2.4 m/s
8.4 m/s
10.8 m/s
15.3 m/s

8.4 m/s

Explanation:

This described situation is related to vertical motion (free fall), with constant acceleration (acceleration due gravity), and in this case, the following formula will be useful:

(1)

Where:

Is the final velocity of the ball

Is the initial velocity of the ball (it was dropped)

is the acceleration due gravity

is the distance at which the ball hits the ground (taking into account , )

(2)

(3)

Finally:

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.