A car comes to a gentle stop at a stoplight. The car was traveling at 35 mph and comes to a full stop in 45 seconds. What is the acceleration during this time in mph/minute?

Question

Quizplus · Accepted Answer

Step 1: Find the acceleration
Acceleration (a) = Change in Velocity (dV) / Change in Time (dt)
So
a = dV / dt
To solve for dV, subtract v1 (the original velocity) and v0 (the ending velocity)
dV = 0 mph - 35 mph = -35 mph
Next, solve for a:
a = -35 mph / 45 seconds = -0.7778 mph/second
Step 2: Convert units:
-0.7778 mph/s × 60 seconds = -0.013 mph/minute

A Car Comes to a Gentle Stop at a Stoplight