Predicting Changes in Kinetic Energy Quick Check
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Question
Which object has the greatest kinetic energy?(1 point)
Responses
a yellow car with a mass of 500 kg moving at 12 m/s
a yellow car with a mass of 500 kg moving at 12 m/s
a red car mass of 500 kg moving at 3 m/s
a red car mass of 500 kg moving at 3 m/s
a blue car with a mass of 500 kg moving at 30 m/s
a blue car with a mass of 500 kg moving at 30 m/s
a green car with a mass of 500kg moving at 21 m/s
a blue car with a mass of 500 kg moving at 30 m/s
The object with the greatest kinetic energy is the blue car with a mass of 500 kg moving at 30 m/s.
To determine which object has the greatest kinetic energy, we need to use the formula for kinetic energy:
Kinetic Energy = 0.5 * mass * velocity^2
Let's calculate the kinetic energy for each object.
a yellow car with a mass of 500 kg moving at 12 m/s:
Kinetic Energy = 0.5 * 500 kg * (12 m/s)^2 = 36,000 joules
a red car with a mass of 500 kg moving at 3 m/s:
Kinetic Energy = 0.5 * 500 kg * (3 m/s)^2 = 2,250 joules
a blue car with a mass of 500 kg moving at 30 m/s:
Kinetic Energy = 0.5 * 500 kg * (30 m/s)^2 = 225,000 joules
a green car with a mass of 500 kg moving at 21 m/s:
Kinetic Energy = 0.5 * 500 kg * (21 m/s)^2 = 220,500 joules
Comparing the values, we can see that the blue car with a mass of 500 kg moving at 30 m/s has the greatest kinetic energy, with a value of 225,000 joules.