The answer is None of the above.
What is acceleration?
Acceleration is the rate at which velocity changes over time, both in terms of speed and direction. A point or object travelling in a straight path is accelerated if it accelerates or decelerates.
The acceleration imparted to objects as a result of the combined influence of gravitation and centrifugal force.
During juggling, there is no way to slow down ball's acceleration. Gravity acts as a downward acceleration force as soon as a ball is thrown into the air. The only way a juggler may slow down a pattern is by changing the height of his throws because the acceleration of gravity is constant.
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