# physics

98. On which of these hills does the ball roll down with increasing speed and decreasing acceleration along the path? (Use this example if you wish to explain to someone the difference between speed and acceleration.)

99. If you drop an object, its acceleration toward the ground is 10 m/s2. If you throw it down instead, will its acceleration after leaving your hand be greater than 10 m/s2?

100. Can you think of a reason why the acceleration of the object thrown downward through the air in the preceding question would actually be less than 10 m/s2?

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1. 99. If you drop an object:
Vo = 0 = Initial velocity.
a = g = 10 m/s^2.

If you throw it down:
Vo > 0
a = g = 10 m/s^2.

So in both cases, the acceleration remains constant at 10 m/s^2.

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posted by Henry

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