(a) A student measures two quantities a and b and obtains the results a = 10 ± 1 N and b = 272 ± 1 s. He now calculates the product q = ab. Find his answer, giving both its percent and absolute uncertainties, as found using the provisional rule (2.28). (b) Repeat part (a) using a = 3.0 ft ± 8% and b = 4.0 lb ± 2%.