While you have a 40m head start you begin to run at a constant velocity of 35km/h. Your professor eager to teach you more physics begins chasing at a constant velocity of 110km/h. How long does it take your professor to catch up and teach you more physics?
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- a) A car starts from rest, speeds up with constant acceleration, and travels 720 meters in 9 seconds. What was the average velocity of the car in m/s? b) What was the final velocity of the car (in m/s)? c) Consider that the car started at rest. What was the change in velocity of the car (in m/s)? d) What was the acceleration of the car (in m/s2)?Hicham El Guerrouj of Morocco holds the world record in the 1500 m running race. He ran the final 400 m in a time of 51.9 s. What was his average speed in mph over the last 400 m?A. 14.2 mph B. 15.5 mphC. 17.2 mph D. 23.9 mph77 and 78
- A cheetah uses a non-constant acceleration to go from 10 m/s to 25 m/s after 5 seconds. Choose all the following statements that are correct. Than The average acceleration is 3 m/s2. We have enough information to find the distance traveled during this 5 seconds. You can't determine the average acceleration because acceleration is not constant. We have enough information to find the average velocity.2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.To settle an argument Dr Goulding and his Mrs (his wife) decide to have a 40.0 m lang snowshoe race, with the prize being a very nice locally made face mask. At the start line they shake hands and when their cat helper Charlie fires the start gun they begin running on thier snowshoes. Dr Gaulding reaches his maximum speed of speed of 2.68 m/s in a time of 10.0 s while The Mrs accelerates to her maximum speed of 3.00 m/s at a rate of a,-0.20 m/s2 How far are they apart when the runners have both reached their maximum running speeds? Your Answer: Answer units
- 4. What was the initial velocity of an object that moved 100 m in 5.60 s reaching a final velocity of 15.0 m/s in that time? Was the object speeding up or slowing down? 5. A car traveling at 40 km/h accelerates at 2.3 m/s² for 2.7 s. How far has it traveled in that time? What is its final velocity?One of the most difficult things to learn in physics is that our everyday language is not always precise enough. For instance, we might say a car is “slowing down”, but that only gives us information abouts velocity, not its acceleration. What can we say about the velocity of a car which has negative acceleration in the x-direction? a. It is slowing down. b. The x-component of its velocity is decreasing. c. The x-component of its velocity is negative. d. It is speeding up. e. The x-component of its velocity is positive. f. The x-component of its velocity is increasing.