Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 2, Problem 20P
(a)
To determine
The acceleration of the sprinter.
(b)
To determine
The total time sprinter required to complete
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A sprinter starts from rest and accelerates to her maximum speed of 11.0 m/s in a distance of 9.7 m.
(a) What was her acceleration? (b) If this maximum speed is maintained for another 89.1 m, how long does it take her to run 98.8 m?
A drag car starts from rest and accelerates at a rate of 10.0-m/s2 for a distance of 400-m (~1/4 mile). (a) How long did it take the car to travel this distance? (b) What is the speed of the car at the 400-m mark?
A sprinter starts from rest and accelerates to her maximum speed of 9.7 m / s in a distance of 9.7 m. What was her acceleration,if you assume it to be constant? And if this maximum speed is maintained for another 91.8 m how long does it take her to run 101.5 m?
Chapter 2 Solutions
Physics Fundamentals
Ch. 2 - Prob. 1QCh. 2 - Prob. 2QCh. 2 - Prob. 3QCh. 2 - Prob. 4QCh. 2 - Prob. 5QCh. 2 - Prob. 6QCh. 2 - Prob. 7QCh. 2 - Prob. 8QCh. 2 - Prob. 9QCh. 2 - Prob. 1P
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- A car starts from rest and has an acceleration of 17 m/s2. (a) What is its velocity after 11 seconds? Give your answer in m/s. (b) How far has it gone in meters?arrow_forward(a) What is the average acceleration of a skier who, starting from rest, reaches a speed of 8.0 m/sec when going down a slope for 5.0 sec? (b) How far does the skier travel in this time?arrow_forwardWalk along a long straight level path in the woods you go 30 m in 6.2 s, stop for 32 s, and then continue on in the same direction 40 m more in 15 s. What was your average speed for all of this?arrow_forward
- A motorboat starting from rest travels in a straight line on a lake.(a) If the boat achieves a speed of 7 m/s in 11.9 s, what is the boat's average acceleration?Then, in 3.1 more seconds, the boat's speed is 20 m/s.(b) What is the boat's average acceleration for the total time?arrow_forwardA commuter backs her car out of her garage with an acceleration of 1.40 m/s². (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her acceleration?arrow_forwardAnswer the following questions regarding the motion of a runner. (a) A runner starts a race at rest then accelerates for 10.0 s reaching a velocity of 9 m/s. How far does she run during this 10.0 s ? (b) b) What is the acceleration during this 10.0 s ? (c) She then maintains the velocity of 9.50 m/s for the next 48 meters. How long does it take for her to run this 50 meters at the maintained velocity ?arrow_forward
- At the end of a race a runner decelerates from a velocity of 8.70 m/s at a rate of 2.10 m/s². (a) How far in meters does she travel in the next 4.60 s? (Assume the deceleration of 2.10 m/s is constant over the full 4.60 s.) (b) What is her final velocity in m/s? (c) Evaluate the result. Does it make sense?arrow_forwardAt the scene of a car accident, the forensic investigator measured the skid marks from one of the vehicles to be 83 m long. He also knows the typical acceleration for a car when you slam on the brakes is -4 m/s2. The speed limit for this area is 100 km/hr (about 28 m/s). Was the car speeding before it hit the brakes?arrow_forwardAt the scene of a car accident, the forensic investigator measured the skid marks from one of the vehicles to be 83 m long. He also knows the typical acceleration for a car when you slam on the brakes is -4 m/s 2. The speed limit for this area is 100 km/hr (about 28 m/s). Was the car speeding before it hit the brakes?arrow_forward
- A hippopotamus can run up to 9.86 m/s. Suppose a hippopotamus uniformly accelerates 0.28 m/s² until it reaches a top speed of 9.86 m/s. If the hippopotamus has run 25.1 m, what is its initial speed in m/s? (round your answer to two decimal places; DO NOT include units)arrow_forwardA woodchuck runs 20 m to the right in 5 s, then turns and runs 10 m to the left in 3 s. (a) What is the average velocity of the woodchuck? (b) What is its average speed?arrow_forwardA pilot ejects from his aircraft and falls 80 m from the ground without friction. Whenhe opens his parachute, he decelerates at 3.5 m/s2. The pilot hits the ground at 5 m/s.How long was the pilot in the air and at what height did he begin his fall?arrow_forward
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