Which object has the greatest kinetic energy?(1 point)
Responses
a baseball with a mass of 0.5 kg moving at 30 m/s
a baseball with a mass of 0.5 kg moving at 30 m/s
a car with a mass of 1,000 kg moving at 30 m/s
a car with a mass of 1,000 kg moving at 30 m/s
a car with a mass of 1,000 kg moving at 3 m/s
a car with a mass of 1,000 kg moving at 3 m/s
a person with a mass of 70 kg walking at 3 m/s
a person with a mass of 70 kg walking at 3 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:
1. For the first option, a baseball with a mass of 0.5 kg moving at 30 m/s:
Kinetic energy = 0.5 * 0.5 kg * (30 m/s)^2 = 0.5 * 0.5 kg * 900 m^2/s^2 = 225 J
2. For the second option, a car with a mass of 1,000 kg moving at 30 m/s:
Kinetic energy = 0.5 * 1000 kg * (30 m/s)^2 = 0.5 * 1000 kg * 900 m^2/s^2 = 450,000 J
3. For the third option, a car with a mass of 1,000 kg moving at 3 m/s:
Kinetic energy = 0.5 * 1000 kg * (3 m/s)^2 = 0.5 * 1000 kg * 9 m^2/s^2 = 4,500 J
4. For the fourth option, a person with a mass of 70 kg walking at 3 m/s:
Kinetic energy = 0.5 * 70 kg * (3 m/s)^2 = 0.5 * 70 kg * 9 m^2/s^2 = 945 J
Comparing the results, we can see that the car with a mass of 1,000 kg moving at 30 m/s has the greatest kinetic energy of 450,000 J.