Runner Velocity vs. Time 14 12 10 2 8. 10 12 Time (s) Figure 2.67 Velocity (m/s)

A particle mnoves in a straight line with an initial velocity of 50 m/s and constant acceleration 50 m/s. (a) What is its displacement at t = 8 s? (b) What is its velocity at this same time?

Running with an initial velocity of +9.2 m>s, a horse has anaverage acceleration of -1.81 m>s2. How much time does it takefor the horse to decrease its velocity to +5.5 m>s?

A Fast Pitch. The fastest measured pitched baseball left the pitcher's hand at a speed of 45.0 m/s. If the pitcher was in contact with the ball over a distance of 1.50 m and produced con- stant acceleration, (a) what acceleration did he give the ball, and (b) how much time did it take him to pitch it?

On a 200 km bike cycle ride, you ride the first 90 km at an average speed of 20 m/s. What mustyour average speed over the next 40 km be to have your average speed for the total 200 km be?(b) Given this average speed for the first 90 km, can you possibly attain an average speed of80 m/s for the total 200 km ride? Explain.

A top fuel dragster slows at a constant 3.00 m/s2 over a quarter mile track. What final speed would the dragster achieve by the end of the quarter mile, if the initial speed was 50.12 m/s.

If a boat achieves a speed of 6.0 m/s in 12s, what is the boats average acceleration? (b) then, in 4.0 more seconds the boats speed is 10 m/s. What's is the boats average acceleration for the total time?

At the end of a race a runner decelerates from a velocity of 8.00 m/s at a rate of 0.300 m/s2.(a) How far does she travel in the next 14.0 s? (b) What is her final velocity

QuesuvI Z VETJ Points: 2 Kim is waiting for the results of her physics exam. She walks 8.0 metres north in 5.0 seconds, then 25 metres south in 15.0 seconds, then 10.0 metres north in 10.0 seconds. Use this information to answer the following questions: (1) What is Kim's average speed? (ii) What is Kim's average velocity? DA) Kim's speed is 1.4 m/s B) Kim's speed is 0.23 m/s C) Kim's speed is -0.23 m/s D) Kim's speed is -1.4 m/s E) Kim's velocity is 1.4 m/s [N] F) Kim's velocity is 0.23 m/s [S] G) Kim's velocity is 0.23 m/s [N] ⒸH) Kim's velocity is 1 4 m/s [S] Clear selection Question 3 of 13

On a 200 km bike cycle ride, you ride the first 90 km at an average speed of 20 m/s. What mustyour average speed over the next 40 km be to have your average speed for the total 200 km be?(a) 60 m/s?