Final answer:
It would take a car 5 seconds to reach a velocity of 60 ft/sec starting from rest if it is accelerating at a constant rate of 12 ft/sec2.
Step-by-step explanation:
The question asks how many seconds required for a car accelerating at 12 ft/sec2 to reach a speed of 60 ft/sec starting from rest. To solve this, we can use the formula for acceleration:
a = (v - u) / t
Where a is acceleration, v is final velocity, u is initial velocity (which is 0 since the car starts from rest), and t is time. Rearranging the formula to solve for time gives us:
t = (v - u) / a
Plugging in the known values:
t = (60 ft/sec - 0) / 12 ft/sec2 = 5 seconds
Therefore, it will take the car 5 seconds to reach the speed of 60 ft/sec from rest.