A ball is thrown vertically upward at 21 m/s. Taking m/s and ignoring air resistance, what is the maximum height reached above the launch point?

Answer and explanation

Correct answer: A. 22.5 m

  1. Step 1: At the top the velocity is zero: .
  2. Step 2: m.
Answer
22.5 m.
Why not the others: 45 m: the factor 2 in is forgotten. 2.143 m: that is the time to the top, not the height. 90 m: is replaced by .

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