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**Physics Quicky A Stone Thrown Downward**

A boy on a bridge throws a stone vertically downward with an initial velocity of 14.7 m/s toward the river below. If the stone hits the water 2.00 s later, what is the height of the bridge above the water?

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Kinematic Practice Physics September 16, 2008

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**1. How far does a bicyclist travel, if he has been riding for 20 seconds at 4 m/s?**

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**2. If a car travels 240 meters in 60 seconds, what was its average speed?**

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3. A car traveling initially at 12 m/s accelerates at 5 m/s2 for 8 seconds. What is its new velocity?

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**4. How much time does it take an eagle to travel 420 meters, moving at a rate of 6 m/s?**

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5. An object initially moving with a velocity of 5 m/s is speeds up at a rate of 6 m/s2 for 2 s. What is the total distance traveled?

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6. A racecar with an initial velocity of 20 m/s decelerates at a rate of 2 m/s2 for 4 seconds. What is its new velocity?

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7. A racecar with an initial velocity of 20 m/s decelerates at a rate of 2 m/s2 for 4 seconds. How far has it traveled?

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8. A car initially moving at 12 m/s increases its velocity to 36 m/s in 6 seconds. What is the car’s acceleration?

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**9. A student drops an apple from a building 20 meters high**

9. A student drops an apple from a building 20 meters high. How long does it take to hit the ground?

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10. How far does a train with an initial velocity of 45 m/s travel when accelerating at 4 m/s2 for 10 s?

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**11. A car traveling at 8 m/s accelerates at 2 m/s2 for 3 seconds**

11. A car traveling at 8 m/s accelerates at 2 m/s2 for 3 seconds. What is its new velocity?

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**12. A horse traveling with a velocity of 20 m/s decelerates at 5 m/s2 until it comes to a rest.**

How far did it travel ?

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**13. A ball is thrown upward with an initial velocity of 30 m/s**

13. A ball is thrown upward with an initial velocity of 30 m/s. Where is the ball after 4 seconds?

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**14. A boat moving at a speed of 6 m/s accelerates at 3 m/s2**

14. A boat moving at a speed of 6 m/s accelerates at 3 m/s2. How fast will the car be moving after it has accelerated for 45 m?

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15. A ball is rolling with an initial velocity of 24 m/s and slows to a velocity of 4 m/s in 5 seconds. What is its acceleration?

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**16. How long does it take a car to accelerate from 2 m/s to 10 m/s with an acceleration of 4 m/s2?**

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17. A moving car slows down at 3 m/s2 for 4 seconds until it reaches a stop. What was its initial velocity?

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18. A ball is thrown downward at an initial velocity of 6 m/s from a bridge. How far does the stone travel in 3 seconds?

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**19. How long does it take a car to slow down from 45 m/s to 25 m/s decelerating at 5 m/s2?**

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**20. A car traveling initially at 8 m/s accelerates at a rate of 4 m/s2 for 2 s.**

What is the car’s velocity at that time? The car then blows a tire, slows and comes to a halt, decelerating at 8 m/s2. How long did it take to stop?

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**PROJECTILE (2-D) MOTION.**

* A ball is thrown from a height of 25.0 m above the ground with an initial horizontal velocity of 8.25 m/s. How long is the ball in flight before striking the ground? How far from the building does the ball strike the ground? Next Lecture: PROJECTILE (2-D) MOTION.

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**Physics Homework 9/17 Read Chapter 2 Conceptual Physics (Hewitt)**

Do Problems 22, 23, 26, 27, 30, 33, 41, 43, 44, 48 DO RIGHT NOW… In Wilson Chapter 2 (37, 41, 63, 87,107)

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