On your bike, you start from rest and accelerate to the speed of 5m/s in 20 seconds(assume constant acceleration), and keep going at this speed on a level ground for 500m further . During your trip, the average air drag force on you is 13N , and the rolling friction force is 9N . Assume total mass of yourself and the bike is 75kg , % mechanical energy efficiency in your body is 20%, and a BMR of 100W. How much Calories you have spent to accomplish this