6. A police car o: receive an em increase in spe initial speed o of 3.0 seconds answer in both Answer: The The r Source: modi
6. A police car o: receive an em increase in spe initial speed o of 3.0 seconds answer in both Answer: The The r Source: modi
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Transcribed Image Text:9.
A police car of mass 2.4x10ʻkg is travelling on the highway when the officers
receive an emergency call. They increase the speed of the car to 33m/s. The
increase in speed results in 3.1×10°J of work done on the car. Determine the
initial speed of the police car in kilometers per hour. If this were done in a total
of 3.0 seconds, what is the minimum power of the vehicle? Express your final
answer in both Watts and horsepower.
Answer: The initial speed is approximately 28.9m/s or 1.0×10°km/ hr .
The minimum power will be roughly 1.0×10°W or 1.4×10 hp.
Source: modified from Nelson, Physics 12, 2009, p. 174, Sample Problem 3
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