Explanation Work-energy theorem states that the work done by a body is equal to the change in its kinetic energy. Given: The initial velocity of the car is u = 35 km/h . The final velocity of the car is v = 65 km/h . The mass of the car is m = 1300 kg . The time taken to reach the final speed is t 1 = 3.8 s . Formula used: Initial power: P 1 = 1 2 m ( v 2 − u 2 ) t 1 If the time taken to increase the velocity to 95 km/h in the second case is t 2 : P 2 = 1 2 m ( v 2 2 − u 2 2 ) t 2 Calculations The power of the car in the first case is: P 1 = 1 2 m ( v 2 − u 2 ) t 1 P 1 =

Physics: Principles and Applications -- Pearson e Text Instant Access (Pearson+)

7th Edition

ISBN: 9780137679065

Author: Douglas Giancoli

Publisher: PEARSON+

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Chapter 6, Problem 82GP

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The time taken by the car to accelerate from 55 km/h to 95 km/h.

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Chapter 6, Problem 81GP

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