Physics acceleration and velocity problem?

Question

the average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time (in seconds) would be required for the car to accelerate from rest to 59.2 miles per hour?

Answer 1

59.2 miles/hr = 26.46m/s

acceleration = 7 x 9.8 = 68.6m/s/s

using v=u+at

26.46=68.6t

t=0.39 seconds