Explanation Given: A sprinter accelerates from rest to 9.00m/s in 1.38 s. u = 0 v = 9 m/s t = 1.38 s Formula Used: Acceleration = change in velocity change in time . Calculation: Convert velocity from m/s to km/h. v = 9.00 m/s v = 9 × 3600 1000 = 32.4 km/h The time taken was 1.38 s. Convert it into hours = 1 .38 3600 h = 0 .00038 h a) Acceleration in m/s 2 Acceleration = ( final velocity − initial velocity ) t Average acceleration = 9 − 0 1

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ISBN: 2818440071355

Author: GIANCOLI

Publisher: PEARSON

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Chapter 2, Problem 18P

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The acceleration in (a) m/s 2 (b) km/h 2 .