# Physics

posted by Megan

A top fuel dragster can complete a quarter-mile (402 meters) in 4.7 seconds. Assuming that the vehicle starts from rest and that acceleration is constant, calculate (a) the acceleration and (b) the final speed of the top fuel dragster.

1. Scott

the average speed (S) is ... 402 m / 4.7 s

from a zero start, with constant acceleration, the top speed is twice the average
... St = 2 S

acceleration is top speed divided by time
... a = St / 4.7 s

2. Damon

average speed = 402/4.7 = 85.5 m/s

top speed = 2*85.5 = 171 m/s

a = (171-0)/4.7 = 36.4 m/s^2

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