On your bike, you start from rest and accelerate to the speed of 5m/s in 20 (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 12n , and the rolling friction force is 9n . Assume total mass of yourself and the bike is 75kg, % mechanical energy efficiency in your body 20%, and a BMR of 100W . How much Calories you have spent to accomplish this