184- A tennis ball is thrown vertically from a height of 320 cm and after hitting the ground rises to a height of 125 cm. The ground contact time with the ball is 13 ms. If the contact time of the ball with the ground is 13ms, the magnitude of the average acceleration during contact is how many meters per second squared? (Air resistance is neglected. $g = 10\,\dfrac{\text{m}}{\text{s}^2}$) (1) 100, upward (2) 100, downward (3) 1000, upward (4) 1000, downward
\textbf{184-} A tennis ball is thrown vertically from a height of 320 cm and after hitting the ground rises to a height of 125 cm. The ground contact time with the ball is 13 ms. If the contact time of the ball with the ground is 13ms, the magnitude of the average acceleration during contact is how many meters per second squared? (Air resistance is neglected. $g = 10\,\dfrac{\text{m}}{\text{s}^2}$)
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(1) 100, upward \hspace{1cm} (2) 100, downward \hspace{1cm} (3) 1000, upward \hspace{1cm} (4) 1000, downward
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