The forearm is a lever in which the bicep muscles provide an upward force which can raise the arm and carry a load. The diagram below represents the forearm as it holds a load of 60 N. The forearm has a weight of 25 N and the centre of gravity, G of the forearm is marked along with the point, P at which it pivots on the adjoining bone. I. Use the principle of moments to calculate the force, B exerted by the biceps to hold the arm and the load stationary

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Work is reduced while time is decreased

Answer(b) both involve the use of levers;