Which object has the greatest kinetic energy?
A. A blue car with a mass of 500kg moving at 30 m/s
B. A green car with a mass of 500kg moving at 21 m/s
C. A red car mass of 500kg moving at 3 m/s
D. A yellow car with a mass of 500kg moving at 12 m/s
The object with the greatest kinetic energy is the one with the highest mass and speed.
Using the equation for kinetic energy (KE = (1/2) * mass * velocity^2), we can calculate the kinetic energy for each object:
A. KE = (1/2) * 500kg * (30 m/s)^2 = 225,000 J
B. KE = (1/2) * 500kg * (21 m/s)^2 = 110,250 J
C. KE = (1/2) * 500kg * (3 m/s)^2 = 2,250 J
D. KE = (1/2) * 500kg * (12 m/s)^2 = 36,000 J
Therefore, the blue car with a mass of 500kg moving at 30 m/s has the greatest kinetic energy with 225,000 J.