12. Jack and Jill have the same mass and both run down the hill but Jack takes twice as long as Jill who has more power? 13. Jack is double Jill's mass and they run down the hill together, who does more work? 14. The energy of motion is known as 15. F is the symbol for? 16. W is the symbol for? 17. a is the symbol for? 18. m is the symbol for? 19. p is the symbol for? 20. t is the symbol for? growon Tot bail