Ek! A Mouse! (Kinetic Energy Practice) .MLWGS.Honors Physics. 1. If an object's speed doubles, what happens to its kinetic energy? How do you know? 2. What is the kinetic energy of a 1340 kg car moving at 8 m/s? 3. A flamingo on roller skates has a mass of 3.5 kg. What is its change in kinetic energy when its speed increases from 2 m/s to 6.5 m/s? 4. A 4 kg box of paper towels is sliding across a level floor. The box is initially sliding with a speed of 8 m/s and slows to a speed of 1.2 m/s a. What is the initial kinetic energy of the box? b. What is the final kinetic energy of the box? c. How much thermal energy has been generated