wikiHow Calculating the Mass of an Object Practice Problems 1. A book weighs 4 N on Earth. What is its mass? 2. A bowling ball weighs 15 lbs. What is its mass? 3. A person weighs 650 N on Earth. What is their mass? 4. A box weighs 20 lbs. What is its mass? 5. An elephant weighs 5000 N on Earth. What is its mass? 6. A pencil weighs 0.1 N on Earth. What is its mass? 7. A sack of potatoes weighs 50 lbs. What is its mass? 8. A car weighs 2000 lbs. What is its mass? 9. A person weighs 150 lbs on Earth. What is their mass? 10. A dog weighs 200 N on Earth. What is its mass? 11. A basketball weighs 1 N. What is its mass? 12. A bag of flour weighs 5 lbs. What is its mass? 13. A cat weighs 15 N on Earth. What is its mass? 14. A sofa weighs 100 lbs. What is its mass? 15. A truck weighs 10,000 lbs. What is its mass? 16. A person weighs 800 N on Earth. What is their mass? 17. A watermelon weighs 10 N on Earth. What is its mass? 18. A desk weighs 50 lbs. What is its mass? 19. A horse weighs 1000 N on Earth. What is its mass? 20. A backpack weighs 2 N. What is its mass? Page