1. An object moving with a speed of 27 m/s and has a kinetic energy of 800 J, what is the mass of the object?
- Kinetic energy (KE) = 1/2 * m * v^2
- 800 = 1/2 * m * (27)^2
- 800 = 1/2 * m * 729
- 800 = 364.5 * m
- m = 800 / 364.5
- m ≈ 2.19 kg
2. What is the kinetic energy of a 47kg object that is moving with a speed of 15 m/s?
- KE = 1/2 * m * v^2
- KE = 1/2 * 47 * (15)^2
- KE = 1/2 * 47 * 225
- KE = 23.5 * 225
- KE = 5287.5 J
3. An object has a kinetic energy of 80 J and a mass of 40 kg, how fast is the object moving?
- KE = 1/2 * m * v^2
- 80 = 1/2 * 40 * v^2
- 80 = 20 * v^2
- v^2 = 80 / 20
- v^2 = 4
- v = √4
- v = 2 m/s
4. An object moving with a speed of 27 m/s and has a kinetic energy of 140 J, what is the mass of the object?
- KE = 1/2 * m * v^2
- 140 = 1/2 * m * (27)^2
- 140 = 1/2 * m * 729
- 140 = 364.5 * m
- m = 140 / 364.5
- m ≈ 0.384 kg
5. What is the kinetic energy of a 100kg object that is moving with a speed of 12.5 m/s?
- KE = 1/2 * m * v^2
- KE = 1/2 * 100 * (12.5)^2
- KE = 50 * 156.25
- KE = 7812.5 J
Parent Tip: Review the logic above to help your child master the concept of kinetic energy problems worksheet.
