A boy and his bicycle have a total mass of 40 kg. at the top of the hill his speed is 5ms -1 and his speed doubles at the bottom of the hill. The hill is 10 metre height. Calculate
a)the total energy at the top of the hill
b) the total energy at the bottom of the hill
c) the energy lost due to friction

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d