## [solution]: PHYSICS 115 Starting at noon, John drives north along a highway

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Physics 115 Homework Assignment 1 Due date: September 7 th Name __________________________________ 1. a) Starting at noon, John drives north along a highway at a speed of 70 mi/hr until 2:30 pm. How far has he traveled since noon? b) He then continues in the same direction at a different steady speed for a distance of 75 miles until 4:00pm. What was his speed between 2:30pm and 4:00pm? c) From 4:00pm he travels and additional 180 miles in the same direction to arrive at his destination. He travels this final part of his journey at a constant speed of 60 mi/hr. When does he get to his destination? d) What is John’s average speed between his start at noon and the time he arrives at his destination? 2. A long-distance runner has an average speed of 5 m/s during a race. How far does the runner travel in 25 min? Express your answer in m, km and miles. 3. A rock is dropped off the side of a bridge and hits the water below 2.5 s later. a) What was the rock’s velocity when it hit the water? b) What was the rock’s average velocity as it fell? c) What is the height of the bridge above the water? 4. A dog chasing a ball starts at rest and accelerates uniformly over a distance of 5 meters. It takes the dog 1 s to cover that first 5 m. What is the dog’s acceleration, and what speed is the dog traveling when it reaches the 5 m point? 5. A driver in a blue car traveling at 50 km h?1 sees a red car approaching in his rear view mirror. The red car is traveling at 60 km h?1 and is 30 m behind the blue car when first spotted. a) How many seconds from the time the driver of the blue car first noticed it until the red car passes the blue car? b) How much farther down the road will the blue car travel in this time? 6. A bullet is fired horizontally from a gun that is 1.5 m from the ground. The bullet travels at 1000 m s?1 and strikes a tree 150 m away. How far up the tree from the ground does the bullet hit? [Neglect air resistance.] Page 1 of 1

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