Salam could not pedal his bicycle up the incline because he had a heavy bag of rice and full school bag, making it difficult to gain kinetic energy from pedaling. There are two types of energy: potential energy from an object's position, such as the height of an object above the ground, and kinetic energy from an object's motion. Kinetic energy can be calculated using the formula K=1/2mv^2, and for a bullet with mass 0.005kg moving at 200m/s, its kinetic energy is 20 joules.