# Chapter 4 - Kinematics in Two Dimensions - Exercises and Problems: 12

The ball was thrown from a height of 19.6 meters.

#### Work Step by Step

We can find the time $t$ of the ball's flight: $t = \frac{x}{v_x} = \frac{50~m}{25~m/s}$ $t = 2.0~s$ We can find the initial height of the ball: $y = \frac{1}{2}gt^2$ $y = \frac{1}{2}(9.8~m/s^2)(2.0~s)^2$ $y = 19.6~m$ The ball was thrown from a height of 19.6 meters.

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