Acar has a kinetic energy of 1.9 × 103 joules. if the velocity of the car is decreased by half, what is its kinetic energy? 2.2 × 102 joules 4.7 × 102 joules 5.2 × 102 joules 5.8 × 103 joules

4.7 x 10^2 Joule

Explanation:

The energy possessed by the motion of body is called its kinetic energy.

The formula for the kinetic energy of a body is given by

K.E = \frac{1}{2}mv^{2}    

The kinetic energy is directly proportional to the square of velocity and the mass of body.

  ..... (1)

..... (2)

Dividing equation ((2) by equation (1), we get

K2 = 4.7 x 10^2 Joule