Lorna walked to the market to buy the week’s supply of pork, fish, and vegetables for her family. What is her kinetic energy if she weighs 45kg and moves at a speed of 3.2m/s?
Question
Lorna walked to the market to buy the week’s supply of pork, fish, and vegetables for her family. What is her kinetic energy if she weighs 45kg and moves at a speed of 3.2m/s?
Solution
The kinetic energy (KE) of an object can be calculated using the formula:
KE = 1/2 * m * v^2
where: m is the mass of the object (in kg) v is the speed of the object (in m/s)
Given: m = 45 kg v = 3.2 m/s
Substituting the given values into the formula:
KE = 1/2 * 45 kg * (3.2 m/s)^2
First, square the speed:
(3.2 m/s)^2 = 10.24 (m^2/s^2)
Then, multiply that by the mass and 1/2:
KE = 1/2 * 45 kg * 10.24 m^2/s^2 = 230.4 Joules
So, Lorna's kinetic energy as she walks to the market is 230.4 Joules.
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