Suppose a moving car has 750 J of KE. If the car's speed doubles, how much KE will it have?

If the speed is doubled then the kinetic energy will be 3000J.

Explanation:

The kinetic energy is calculated by ,

KE =(1/2) (M x V x V)

750 = (1/2) (M x V x V)

750(2) = M x V x V

1500 = M x V x V

If the speed is doubled then the kinetic energy will be

KE = (1/2) ( M x 2V x 2V)

KE = (1/2) (4) (M x V x V)

The value of (M x V x V) = 1500

So,

KE = (1/2) (4) (1500)

KE = 3000J

If the speed is doubled then the Kinetic energy will be 3000J

f=ma newton's second law 7x8=56n