Question

A student is on a balcony 15.6 m above the street. She throws a ball vertically downward at 10.7 m/s.

What is the velocity of the ball as it strikes the ground?

Answer 1

20.65 m/s

Step-by-step explanation:

You are gonna wanna use a calculator for this one

so we will write all the known variables:

h = 15.6 m

initial velocity (u) = 10.7 m/s

acceleration (a) = 10 m/s/s (gravity)

From the third equation of motion:

v² - u² = 2ah

v² - (10.7)² = 2(10)(15.5)

v² - (10.7)² = 312

v² = 312 + 114.49

v² = 426.49

v = 20.65 m/s