Respuesta :
The kinetic energy the ball will have just before hitting the ground is 0.196 kJ.
Define kinetic energy in your words?
The energy that an object has because it is moving is known as kinetic energy in physics.
In other words it can be defined as the amount of effort that is required to accelerate a body of a specific mass from rest to its specified velocity is termed as kinetic energy.
The following informations are given in the question,
Mass of the ball, M = 4 kg
Height of the ledge, S = 5 m
Initial velocity of the ball, u = 0 m/s (at rest)
From the third equation of motion, we have
v^2 = u^2 + 2a × S
= 0 + 2 × 9.8 × 5
= 98
v = √(98)
= 9.889 m/s
= 9.9 m/s
Kinetic energy is found out using the formula, E = 1/2 × mass × v^2
Since the initial kinetic energy of the ball is 0 as its initial velocity is 0 or the body was at rest, therefore,
The final kinetic energy of the ball,
Ef = 1/2 × 4 × 9.9^2
= 196 J
= 0.196 kJ
Hence, the kinetic energy the ball will have just before hitting the ground is 0.196 kJ.
To learn more about kinetic energy from the given link
https://brainly.com/question/8101588
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