# Physical Science

## Chapter 4: Energy

### Solve a Simple Equation

 1. A jogger whose mass is 65 kg is moving at a speed of 4 m/s. What is the jogger's kinetic energy? A) 240 J B) 1040 J C) 520 J D) 400 J 2. A jogger whose mass is 70 kg is moving at a speed of 3 m/s. What is the jogger's kinetic energy? A) 160 J B) 180 J C) 315 J D) 400 J 3. A jogger whose mass is 75 kg is moving at a speed of 4 m/s. What is the jogger's kinetic energy? A) 1200 J B) 600 J C) 750 J D) 300 J 4. What is the kinetic energy of a baseball moving at a speed of 50 m/s if the baseball has a mass of 0.15 kg? A) 188 J B) 376 J C) 94 J D) 400 J 5. What is the kinetic energy of a baseball moving at a speed of 60 m/s if the baseball has a mass of 0.15 kg? A) 190 J B) 200 J C) 270 J D) 540 J 6. What is the kinetic energy of a baseball moving at a speed of 45 m/s if the baseball has a mass of 0.15 kg? A) 76 J B) 98 J C) 150 J D) 152 J 7. A car moving at a speed of 20 m/s has a kinetic energy of 200,000 J. What is the car's mass? A) 1000 kg B) 1200 kg C) 1400 kg D) 1600 kg 8. A car moving at a speed of 20 m/s has a kinetic energy of 250,000 J. What is the car's mass? A) 1200 kg B) 1250 kg C) 1400 kg D) 1500 kg 9. A sprinter has a mass of 80 kg and a kinetic energy of 3000 J. What is the sprinter's speed? A) 6 m/s B) 7 m/s C) 8 m/s D) 9 m/s 10. A sprinter has a mass of 80 kg and a kinetic energy of 2500 J. What is the sprinter's speed? A) 12 m/s B) 15 m/s C) 8 m/s D) 10 m/s