1. Acceleration
  2. Speed
  3. Potential energy
  4. Distance
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1 Answers

Option 1 : Acceleration

Acceleration tells you the rate at which the velocity is changing. An acceleration can cause speed to increase, decrease, and even stay the same. So when a ball is thrown upward with a speed of 9.8 m/s, the velocity has a magnitude of 9.8 m/s in the upward direction. Now the ball is under the influence of gravity, which, on the surface of the Earth, causes all free - falling objects to undergo a vertical acceleration of –9.8 m/s2. This acceleration is negative because its direction is vertically downward. And thus the difference between positive and negative acceleration of 9.8 m/s is zero.

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