An electric drag racer is much like its piston engine counterpart, but instead i

Question

An electric drag racer is much like its piston engine counterpart, but instead it is powered by an electric motor running off of onboard batteries. These vehicles are capable of covering a 1/4 mile straight-line track in 12 s .

Problem 2.35: Electric Drag Racer. An electric drag racer is much like its piston engine counterpart, but instead it is powered by an electric motor running off of onboard batteries. These vehicles are capable of covering a mile straight-line track in 12 s Part A Determine the acceleration of the drag racer in units of m/s2. (Assume that the acceleration is constant throughout the race.) Express your answer in meters per second squared to two significant figures. m/s Submit My Answers Give Up Part B How does the value you get compare with the acceleration of gravity? O It is equal to the acceleration due to gravity O It is less than the acceleration due to gravity O It is greater than the acceleration due to gravity Submit My Answers Give Up

Explanation / Answer

A)

Vi=0m/s since racer starts from rest

t=12

d=0.25mile = 402 m

Use kinematic equations

Vf=Vi+at ----------(1)

Vf^2+Vi^2+2*a*d-----------(2)

Combining (1) and (2) ,

(at)^2= 2*a*d

Plugging known values

(12a)^2 = 2*a*402    => a= 5.58 m/s^2

B) Comparing a=5.58m/s^2 with g= 9.8m/s^2

A is less than aceeleration of gravity

C) Vf= Vi+a*t

Vf= 0+5.58*12 = 67m/s = 150mile/h

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