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GK QUESTION#2987

A ball is projected vertically upward with a speed of 20 m/s. If air resistance is neglected, what will be its greatest height? (Take g = 9.8 m/s²)

  1. A10.2 m
  2. B15.8 m
  3. C22.4 m
  4. D20.4 mCorrect answer
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Answer

D. 20.4 m

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Explanation

At the highest point the vertical speed is zero. Using v² = u² − 2gh gives h = 20²/(2 × 9.8) ≈ 20.4 m, neglecting air resistance.

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