Question

You throw a ball downward from a window at a speed of 1.7 m/s. How fast will it be moving when it hits the sidewalk 2.5 m below?

Answer 1

7.43m/s

Step-by-step explanation:

Given parameters:

Initial velocity = 1.7m/s

Height = 2.5m

Unknown:

Final velocity = ?

Solution:

To solve this problem, we apply one of the motion equation. The most fitting one given the parameters is;

V² = U² + 2gh

where V is the final velocity

U is the initial velocity

g is the acceleration due to gravity = 9.8m/s

h is the height

Input the parameters and solve;

V² = 2.5² + 2(9.8)(2.5)

V = 7.43m/s