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) 296 mi/h
C) 188 mi/h
D) 135 mi/h

Question

Quizplus · Accepted Answer

To find the final velocity, use the formula v = u + at, where u = initial velocity (0), a = acceleration, and t = time (6.70 s). First, find acceleration using s = ut + 0.5at^2, where s = 1/4 mile = 0.25 miles = 402.336 meters. Solve for a, then use it to find v. Convert v from m/s to mi/h. The correct answer is approximately 269 mi/h.

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