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mikebmxer

A ball is thrown directly upward from ground level with an initial speed of 80 ft/s. How high will it go? When will it return to the ground? explain please.

  • 2 years ago
  • 2 years ago

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  1. ktklown
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    Do you know the acceleration of gravity on Earth's surface?

    • 2 years ago
  2. mikebmxer
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    it doesnt say in the problem.

    • 2 years ago
  3. henkjan
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    you can solve it by conservation of energy... 1/2*v^2 = g*h Although you exclude drag from the air in this equation.

    • 2 years ago
  4. ktklown
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    Well, the problem probably assumes you know the acceleration of gravity, which is -32f/s^s. So plug that into the motion equation v^2 = v0^2 + 2as, and solve for s.

    • 2 years ago
  5. henkjan
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    1/2*80^2 = 32*h h = 100 ft

    • 2 years ago
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