Answer the ff problem and provide the solution with an explanation of each step.

1. A useful and easy-to-remember approximate value for the number of seconds in a year is x 10^7. Determine the percent error in this approximate value. Remember that there are 365.25 days in one year

2. A race car starts from rest and travels east along a straight and level track. For the first 5.0 s of the car's motion, the eastward component of the car's velocity is given by v(t) = (0.860 m/s^3)t^2. What is the acceleration of the car when v = 12.0 m/s?