00 previous I 11 of 15 l next Correct Of course, neglecting friction, especially

Question

00 previous I 11 of 15 l next Correct Of course, neglecting friction, especially air friction, is completely unrealistic at such speeds. significant Figures Feedback: Your answer 4.79 s was either rounded differently or used a different number of significant figures than required for this part. Part B A more realistic car would cause the wheels to spin in a manner that would result in the ground pushing it forward with a constant force (in contrast to the constant power in Part A). If such a sports car went from zero to 32.0 mph in time 1.20 s, how long would it take to go from zero to 64.0 mph Express your answer numerically, in seconds. Submit Hints My Answers Give Up Review Part Provide Feedback Continue D 40 4/17/2017

Explanation / Answer

The car is pushed with constant force

=> it has constant acceleration

initial vel =0

final vel = 32 mph = 46.93 ft/s

time t = 1.2s

acceleration a =46.93/1.2 = 39.11 m/s2

final velocity to reach = 64 mph = 93.86 ft/s

time t = v/a = 93.86 /39.11 = 2.4 s

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