Jack is hitting a punching bag to build his muscle. His left fist gains a speed of 5.5 meters per second in 0.1 seconds from rest. The mass of his left fist is 1 kg. What is the magnitude of his acceleration during 0.1 seconds? What is the average net force applied to the fist? (10 points) Hint: Review the definition of acceleration and Newton's second law. Acceleration is defined as the change in velocity divided by the elapsed time. The net force is the product of the mass of an object and its acceleration.