A world-class sprinter can burst out of the blocks and reach essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. a. What is the average acceleration of this sprinter? b. How long does it take her to reach that speed?

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Chapter3: Motion Along A Straight Line
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Problem 64P: An express train passes through a station. It enters with an initial velocity of 22.0 m/s and...
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4. A world-class sprinter can burst out of the blocks and reach essentially top speed (of about 11.5 m/s) in the
first 15.0 m of the race.
a. What is the average acceleration of this sprinter?
b. How long does it take her to reach that speed?
5. With what speed must an object be thrown to reach a height of 91.5 m ? Assume negligibl (small) air
resistance.
6. A construction worker accidentally drops a brick from a high scaffold.
a. What is the velocity of the brick after 7.0 s?
b. How far does the brick fall during this time?
Transcribed Image Text:4. A world-class sprinter can burst out of the blocks and reach essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. a. What is the average acceleration of this sprinter? b. How long does it take her to reach that speed? 5. With what speed must an object be thrown to reach a height of 91.5 m ? Assume negligibl (small) air resistance. 6. A construction worker accidentally drops a brick from a high scaffold. a. What is the velocity of the brick after 7.0 s? b. How far does the brick fall during this time?
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