"a 500kg car which was initially at rest traveled with an acceleration of 5m sec rise to power -2 its kinetic energy after 4 second" using the formular of kinetic energy

1*10^5 Joules

Explanation:

Mass of the car= 500kg.

Acceleration of the car= 5m/s^-2

Time for which car is accelerated= 4 seconds

Initial Velocity=0

By using the equation of motion:

Final velocity= initial velocity + time*acceleration;

Velocity =4*5=20m/s

Kinetic energy= 1/2 * mass* velocity^2

K.E=0.5*500*20^2=1*10^5 Joules

true is the correct answer

hope i

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.