Which object has the greatest kinetic energy?
1. A green car with a mass of 500kg moving at 21 m/s
2. A blue car with mass of 500 kg moving at 30 m/s
3. A red car mass of 500 kg moving at 3 m/s
4. A yellow car with a mass of 500 kg moving at 12 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 can use the formula for kinetic energy:
Kinetic energy (KE) = 1/2 * mass * velocity^2
Let's calculate the kinetic energy for each object:
1. Green car:
KE = 1/2 * 500 kg * (21 m/s)^2
= 1/2 * 500 kg * 441 m^2/s^2
= 110,250 Joules
2. Blue car:
KE = 1/2 * 500 kg * (30 m/s)^2
= 1/2 * 500 kg * 900 m^2/s^2
= 225,000 Joules
3. Red car:
KE = 1/2 * 500 kg * (3 m/s)^2
= 1/2 * 500 kg * 9 m^2/s^2
= 2,250 Joules
4. Yellow car:
KE = 1/2 * 500 kg * (12 m/s)^2
= 1/2 * 500 kg * 144 m^2/s^2
= 36,000 Joules
Based on the calculations, the blue car has the greatest kinetic energy with 225,000 Joules.
To determine which object has the greatest kinetic energy, we need to calculate the kinetic energy for each object using the formula:
Kinetic Energy = 0.5 * mass * velocity^2
Let's calculate the kinetic energy for each object:
1. Green car:
Mass = 500 kg
Velocity = 21 m/s
Kinetic Energy = 0.5 * 500 kg * (21 m/s)^2 = 220,500 joules
2. Blue car:
Mass = 500 kg
Velocity = 30 m/s
Kinetic Energy = 0.5 * 500 kg * (30 m/s)^2 = 225,000 joules
3. Red car:
Mass = 500 kg
Velocity = 3 m/s
Kinetic Energy = 0.5 * 500 kg * (3 m/s)^2 = 2,250 joules
4. Yellow car:
Mass = 500 kg
Velocity = 12 m/s
Kinetic Energy = 0.5 * 500 kg * (12 m/s)^2 = 36,000 joules
Comparing the values, we can see that the blue car has the greatest kinetic energy with 225,000 joules. Therefore, the answer is option 2: A blue car with a mass of 500 kg moving at 30 m/s.