Starting from rest,a dragster travels a straight 1/4 mi racetrack in 6.70 s with constant acceleration.What is its velocity when it crosses the finish line?
A)269 mi/h
B)188 mi/h
C)296 mi/h
D)135 mi/h

Question

Quizplus · Accepted Answer

The dragster's velocity can be calculated using the formula v = u + at, where u is the initial velocity (0 mi/h), a is the acceleration, and t is the time (6.70 s). First, find the acceleration using the formula s = ut + 0.5at^2, where s is the distance (1/4 mi = 0.25 mi). Solving for a gives a = 2s/t^2. Then, convert the final velocity from mi/s to mi/h. The correct answer is approximately 269 mi/h.

Starting from Rest,a Dragster Travels a Straight 1/4 Mi Racetrack