E5. A woman walks a distance of 504 m, with an average speed of 1.4 m/s. What time was required to walk this distance? - & E6. A person in a hurry averages 70 MPH on a trip covering a distance of 500 miles. What time was required to travel that distance? EI0. Starting from rest and moving in a straight line, a runner achieves a velocity of 6 m/s in a time of 2 seconds. What is the average acceleration of the runner? Ell. Starting from rest, a car accelerates at a rate of 6.7 m/s? for a time of 4 seconds. What is its velocity at the end of this time?_ A El13. A car traveling with an initial velocity of 16 m/s accelerates at a constant rate of 2.8 m/s? for a time of 3 seconds. a. What is its velocity at the end of this time?_ {A] b. What distance does the car travel during this process?_ (A El4. A runner traveling with an initial velocity of 1.1 m/s accelerates at a constant rate of 0.8 m/s? for a time of 2 seconds. a. What is his velocity at the end of this time? b. What distance does the runner cover during this process? El6. A runner moving with an initial velocity of 4.0 m/s slows down at a constant rate of 1 6 m/sZ over a period of 2 seconds. a. What is her velocity at the end of this time? b. What distance does she travel during this process? SP3. A car traveling due west on a straight road accelerates at a constant rate for 10 seconds, increasing its velocity from 0 to 30 m/s. It then travels at a constant speed for 10 seconds and decelerates at a steady rate for the next 5 seconds to a velocity of 20 m/s. It travels at this velocity for 5 seconds and then decelerates rapidly to a stop in a time of 4 seconds. a. Sketch a graph of the car's velocity versus time for the entire motion just described. Label the axes of your graph with the appropriate velocities and times. b. Sketch a graph of acceleration versus time for the car. c. Does the distance traveled by the car continually increase in the motion described? Explain. SP4. A car traveling in a straight line with an initial velocity of 10 m/s accelerates at a rate of 3.0 m/s2 to a velocity of 34 m/s. a. How much time does it take for the car to reach the velocity of 34 m/s? b. What is the distance covered by the car in this process? c. Compute values of the distance traveled at 1-second intervals and carefully draw a graph of distance plotted against time for this motion. Ql In order to go from rest to 50 m/s in 10 s, a jet must be able to accelerate at O 2ms2 Q2 Q3 Qa d(m) Acaris the ave O O O O O driven between two nearby towns at an average speed of 50 miles/hour. The magnitude of rage velocity of the car will always be the same as the average speed. will always be less than the average speed. will be the same as or greater than the average speed. will be the same as or less than the average speed. will always be greater than the average speed. Which of the following is not an appropriate unit for measuring acceleration? O O D9 O miles/hr/s ft/s2 m/s km/min/s m/min? An object's distance traveled as a function of time is shown in the graph. The graph shows O an object experiencing an acceleration. (O an object with increasing speed. O an object turning in a circle. O an object moving forward. t(s) Qs dim) = Refer to the graph. The velocity of this object at the start of the motion is positive. zero (it is not moving). = i t(s) negative. Q0Q 0 It is not possible to tell from the graph Q6 The acceleration of a body must be zero at a point where A. the instantaneous velocity is zero but changing. B. the instantaneous velocity is not zero but changing. C. the instantaneous velocity is constant. Q7 A quantity that is a measure of how the velocity of a body changes with time is: A. Displacement. B. Speed. C. Acceleration D. Momentum