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As the starting length of the muscle is increased the initial velocity increases then decreases.
The lighter the weight, the greater the initial velocity of shortening; inverse relationship.
velocity = displacement / time taken
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Acceleration is the rate of change of the magnitude of velocity and the direction in which the velocity changes.
A good example to illustrate the relationship between anatomy and physiology is the relationship between how a skeletal muscle is structured (anatomy) and how it works (physiology) to produce a muscle contraction. Skeletal muscles are organized into units called sarcomeres which are overlapping chains of two different proteins, actin and myosin. That in a nutshell is the microscopic anatomy of skeletal muscle. Physiologically how it works is that the myosin heads latch onto the actin chain pulling it into the center of the sarcomere shortening it which causes the contraction.
Acceleration is the rate at which velocity changes and the direction of the change.
Momentum=mass*velocity
They are one and the same.
Regarding their magnitudes . . . Acceleration is the time rate of change of velocity. Regarding their directions . . . There's not necessarily any relationship between the two.
The velocity of a wave is the product of frequency and wavelength,such that: V=fλ
Centripetal force is = mass * velocity square divided by radius