A ball is thrown vertically upward with an initial velocity of . Assuming , how many seconds does it take to reach its maximum height?

Answer and explanation

Correct answer: B. 3.0 seconds

  1. Step 1: At the maximum height, instantaneous vertical velocity is zero: .
  2. Step 2: Use the kinematic formula .
Answer
3.0 seconds.
Why not the others: '2.0 seconds' computes ; '4.0 seconds' is ; '6.0 seconds' is the total round-trip time back to the ground.

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