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To calculate the acceleration, you can use the formula:
Acceleration (a) = (Final velocity (v2) - Initial velocity (v1)) / Time (t)
Given that the initial velocity (v1) is 45 ft/sec, the final velocity (v2) is 60 ft/sec, and the time (t) is 5 sec, we can substitute these values into the formula:
a = (60 ft/sec - 45 ft/sec) / 5 sec
Simplifying the calculation:
a = 15 ft/sec / 5 sec
a = 3 ft/sec^2
Therefore, the acceleration of the car is 3 ft/sec^2.