Exercise 7

A ball is thrown at the ground from the top of a tall building. The speed of the ball in meters per second is

*v*(*t*) = 9.8*t* + *v*_{0},

where *t* denotes the number of seconds since the ball has been thrown and *v*_{0} is the initial speed of the ball (also in meters per second). If the ball travels 25 meters during the first 2 seconds after it is thrown, what was the initial speed of the ball?

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