Posted by **rosie** on Thursday, June 30, 2011 at 9:36pm.

A 2000 kg car is moving with a velocity of 50 km/hr. What is its kinetic energy? If the car reduces its speed by half, by what factor is the kinetic energy changed?

- physics -
**bobpursley**, Thursday, June 30, 2011 at 9:37pm
ke= 1/2 M V^2

I will be happy to critique your thinking.

- physics -
**rosie**, Thursday, June 30, 2011 at 10:02pm
ke=1/2*2000kg*50

ke=50000

- physics -
**bobpursley**, Thursday, June 30, 2011 at 11:03pm
No. first, you have to have velocity in m/s. Convert km/hr.

Second, thequatioon says square velocity.

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