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A tennis ball is thrown in the vertically upward direction and the ball attains a maximum height of 20 m . The ball was thrown approximately with an upward velocity of

Options

  1. A8 ~m / s
  2. B12 ~m / s
  3. C16 ~m / s
  4. D20 ~m / s

Correct answer

D. 20 ~m / s

Step-by-step solution

aligned & V ^2= u ^2+2 as & 0= u ^2-2 ~g 20 & 0= u ^2-400 & u ^2=400 & u =20 ~m / s aligned

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