Myofibrils are composed of long proteins such as actin, myosin, and titin, and other proteins that hold them together. These proteins are organized into thin filaments and thick filaments, which repeat along the length of the myofibril in sections called sarcomeres. Muscles contract by sliding the thin (actin) and thick (myosin) filaments along each other.
I think the answer is discovery.
Acceleration = change in velocity/change in time
So you should have (20-10)/(0-2)= -10/2 = -5
So your answer is -5
