An object moving at a constant speed travels 20.0 meters in 5.00 seconds. (1 point each) 1. What is the speed of the object? 2. How far does the object move in 10.0 seconds? 3. How long will it take for the object to move 80.0 meters? 4. To find the distance to a cliff, you let out a shout. The echo comes back and reaches you in 1.40 seconds. If the speed of sound in air is 343 m/s, what is the distance to the cliff? (2 points) 5. A Porsche accelerates from 0 to 60.0 mi/hr in a time of 5.80 seconds. What is the acceleration of the car in m/s2? How does this compare to the acceleration of free-fall (9.80 m/s2)? (2 points) Blood flow in the body is observed to slow down as it gets farther from the heart. It has a speed of 30.0 cm/s near the heart, but only 20.0 cm/s at a point 40.0 cm farther along the arterial pathway. Assume there is a constant acceleration and the numbers above all have 2 sig figs. (1 point each) 6. What is the average velocity for that 40.0 cm distance? 7. What is the time it takes the blood to flow that 40.0 cm? 8. What is the acceleration? 9. Starting at 10 am, you bicycle at an average speed of 15.0 mph until noon when you enter the mountains. From noon until 4 pm you average only 10 mph. What is your average speed over the entire 6 h trip? (Hint: The average speed is not the average of the two speeds.) 10. You leave your home at noon hoping to get to your destination, which is 300. miles away, by 5 pm. During the first two hours of your trip you encounter road construction and only average 40.0 mph. What average speed do you need to maintain for the rest of your journey to get there on time? 11. A ball is falling at 20.0 m/s just before it strikes the floor. It leaves the floor at a speed of 16.0 m/s traveling up. Find the ball's average acceleration if the collision lasts 0.0400 s. 12. A chunk of Martian rock falls off a cliff and drops 47.7 m in 5.00 s. What is the acceleration due to gravity on the surface of Mars? 13. A truck is traveling along a straight stretch of freeway at 25.0 m/s. a) How far will it travel in 10.0 s? b) If it then accelerates at 2.00 m/s2 to pass another truck how far will it travel in the next 10.0 s