Question Detail
Question
A ball is thrown vertically upward with an initial speed of 20 m/s. Assuming g = 10 m/s², what is the time taken to reach the maximum height?
Correct Answer
Option B is the correct answer.
Detailed Explanation
At the maximum height, the vertical velocity v_y becomes 0. Using the equation v_y = v_{0y} - gt, where v_{0y} = 20 m/s and v_y = 0, we get 0 = 20 - 10t. Solving for t gives t = 20/10 = 2 s.
Hint
Use the first equation of motion for constant acceleration, v = v₀ + at, but remember that at the top, the velocity is zero and the acceleration is -g.