A ball is thrown vertically upward at 20 m/s. Taking m/s and ignoring air resistance, what is its maximum height?
Answer and explanation
Correct answer: D. 20 m
- Step 1: At the top the speed is zero, so gives . Step 2. Hence m. Answer: 20 m. Why not the others: 40 forgets the factor 2 in the formula, 10 is g, and 200 uses the wrong units.
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