A ball is thrown vertically upward with a speed of . What maximum height does it reach (in m)? (take )

Answer and explanation

Correct answer: B. 45

  1. Step 1: At maximum height during vertical motion under gravity, instantaneous velocity is zero ().
  2. Step 2: Apply the kinematic relation .
  3. Step 3: Substitute initial speed and acceleration due to gravity : .
Answer
45.
Why not the others: 90 evaluates (forgets factor of 2 in denominator); 3 evaluates ascent time ; 60 doubles the maximum height.

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