A ball swinging at the end of a massless string, as shown in the figure, undergoes simple harmonic motion. At what point (or points) is the magnitude of the instantaneous acceleration of the ball the greatest? 
Definitions:
Very-fit
A description of an individual who possesses a high level of physical fitness, often characterized by endurance, strength, and flexibility.
Sources Of Energy
Various origins from which organisms can derive power, commonly including carbohydrates, fats, proteins, and, in broader terms, food and sunlight.
Exercise
Physical activity that is planned, structured, and repetitive for the purpose of conditioning the body.
Cardiorespiratory Fitness
A measurement of how well the body’s circulatory and respiratory systems supply oxygen to muscles during sustained physical activity.
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