(a) How long can you play tennis on the 800 kJ (about 200 kcal) of energy in a candy bar? (b) Does this seem like a long time? Discuss why exercise is necessary but may not be sufficient to cause a person to lose weight.
Step-by-step solution Step 1 of 5 The equation to find the power is, Here is the power, is the work done and is the time period. Step 2 of 5 (a) Use the above formula, Step 3 of 5 Substitute for and for .