Honors Physics - Motion Name: Speed Velocity PLEASE COMPLETE ALL PROBLEMS ON NOT

Question

Honors Physics - Motion Name: Speed Velocity PLEASE COMPLETE ALL PROBLEMS ON NOTEBOOK OR GRAPH PAPER Practice problems-Speed and Velocity 1. What must a runner's averege speed be in order to cover a 5000 m race in 17 minutes and 45 seconds? (Use meters per minute) 2. A horse runs south at a constant speed of 4 m/s for 20 seconds, stops for 15 seconds, then runs to the north at 2 mis for 25 seconds. a. What is the total distance traveled by the horse? b. Calculate the horse's average speed (hint: use your answer to part a). c. Sketch a distance vs. time graph of its motion 3. A track star runs two laps of a 400-meter oval-shaped track in one minute and 48 seconds a. Calculate the overall, average speed in m's. b. Calculate the overall, average velocity in mis 4. Two trains approach each other on parallel tracks. Each train has a speed of 120 km/hr. If they are initially a straight-ine distance of 8.5 km apart, how long will it be before they pass each other? (for an extra challenge, consider how to rework this problem if one train is moving at 120 kmhr while the other is 80 km/hr) Practice problems -graphing from descriptions of motion (complete these on separate paper) 5. A car starts from rest and accelerates for 3 sec at 4 m/s/s, then drives at constant velocity for 5 sec. The car then brakes to a hard stop in just 2 sec. Sketch the d-t, v-t and a-t graphs for the car 6. A ball rolls at 10 m/s for 6 sec and then accelerates at 2 m/s/s for 5 sec. The ball then rolls for 4 sec at a constant velocity. Last, it slows to a stop at a rate of -4 m/s/s. Sketch the d-t, v-t and a-t graphs for the ball. 7. Justin Thyme jogs 12 meters in 3 seconds at a constant velocity, then slows uniformly to a stop in two seconds. Draw the d-4, v-t and a-t graphs of his motion. 8. A sprinter starts from a stop and accelerates at 3 m/s/s for four seconds. The sprinter maintains that speed for 8 more seconds. The sprinter then slows to a stop in 4 seconds. Draw the d-t, v-t and a-t graphs of this motion.

Explanation / Answer

1. The average speed = Total distance / total time taken to cover the distance

here time taken is 17 + (45/60)= 17.75 minutes

v = 5000/17.75 = 281.69 m/ minutes

here i have used 1 minute is 60 sec and 45 sec is equal to 0.75 minute

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