Kinetic Energy Questions
1. Determine the kinetic energy of a 1000-kg roller coaster car that is moving
with a speed of 20.0 m/s.
Answer: 200 000 Joules
2. If the roller coaster car in the above problem were moving with twice the
speed, then what would be its new kinetic energy?
Answer: 800 000 Joules
3. Miss Dee Warter, the former platform diver for the Circus
had a kinetic energy of 15 000 J just prior to hitting the bucket of water.
If Dee's mass is 50 kg, then what is her speed?
Answer: 24.5 m/s
4. A 750 kg compact car moving at 100 km/hr has approximately 320 000 Joules
of kinetic energy. What is the kinetic energy of the same car if it is moving
at 50 km/hr?
Answer: 80 000 J