Answer:
117.6J
Explanation:
Given parameters:
Mass of ball = 2000g
Height = 6meters
Unknown:
Kinetic energy before it comes to rest = ?
Solution:
The potential energy of a body is the energy at rest of a such a body. It is given as:
P.E = mgh
The kinetic energy is the energy due to the motion of a body;
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass
g is the acceleration due to gravity = 9.8m/s²
h is the height
v is the velocity
According to the conservation of energy,
maximum kinetic energy when the ball will be just about to hit the ground = Maximum potential energy
At the point where ball is about to hit the ground;
K.E = P.E
convert the mass to kg = 2kg
K.E = mgh = 2kg x 6m x 9.8 = 117.6J
