The kinetic energy of a car is 1.00 x 10⁵ J. If the car's speed is increased by 20 percent, the kinetic energy of the car becomes

Question

Quizplus · Accepted Answer

The kinetic energy of an object is given by:
KE = 1/2 * m * v^2
where m is the mass of the object and v is its velocity.

Since the mass of the car is constant, if the speed is increased by 20 percent, the new kinetic energy will be:
KE' = 1/2 * m * (1.2v)^2
    = 1/2 * m * (1.44v^2)
    = 1.44 * KE

Therefore, the new kinetic energy is 1.44 times the initial kinetic energy, or 1.44*1.00x10^15 J = 1.44x10^15 J, which corresponds to choice C.

The Kinetic Energy of a Car Is 1