Unit 4 - Problem 3 ==> Weight lifting workout

W = m*g*h = work done in joules

• m = 20, g = 10 m/s/s, h = 1 m ==> for one repetition
• $$W = 20*10*1 = 200$$
• Workout is for 4 minutes which equals 240 seconds
• Every second we do two-thirds of a repetition
• $$Repetitions = (\frac{2}{3}) 240 = 160$$
• $$joules = 200 * 160 = 32000$$
• There are 4200 joules in a calorie.
• $$calories = \frac{32000.0}{4200.0} = 7.6$$