Question

A ball is thrown off the top of a building and lands on the ground below.

Answer 1

Answer:

Mass and velocity.

Explanation:

Kinetic energy is the energy that an object has due to its movement, mathematically it is represented as follows:

$K=\frac{1}{2} mv^2$

where $m$ is the mass of the object, and $v$ is its velocity at a given point in time.

So we can see that to find the kinetic energy just before the ball hits the gound, we need the quantities:

• mass of the ball
• velocity of the ball before it hits the ground

With the knowledge of these two quantities the kinetic energy of the ball  before touching the gound can be determined.