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1.)You are hitting baseballs. When you toss the ball into the air, your hand is 5...

1.)You are hitting baseballs. When you toss the ball into the air, your hand is 5 feet above the ground (see figure). You hit the ball when it falls back to a height of 3.5 feet. You toss the ball with an initial velocity of 20 feet per second. The height h of the ball t seconds after leaving your hand is given by

h = 5 + 20t ? 16t2.

How much time will pass before you hit the ball? (Round your answer to one decimal place.)

2.) A truck traveled the first 260 miles of a trip at one speed and the last 180 miles at an average speed of 5 miles per hour less. The entire trip took 7 hours. What was the average speed for the first part of the trip?

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