1. The problem statement, all variables and given/known data Solve the following to the proper number of significant figures: a) A loaded truck has mass (2.12 X 10^4 +/- 6 X 10^2) kg and when empty, it has a mass of (1.72 X 10^4 +/- 5 X 10^2) kg. What is the relative uncertainty of the mass of the gravel dumped from the truck? 3. The attempt at a solution Ok, so I go through the math and get Relative Uncertainty = (5 X 10^2 + 6 X 10^2) kg / 4000 = 0.275 My qwuestion is in regards to significant digits. According to me, the # of sig. figs. Here is 1……there is 1 sig. fig. in 5 X 10^2 or 6 X 10^2, whichever you look at, so the answer should be rounded off to one significant figure. This means that the FINAL answer should be 0.3. b) v(initial) = 10.5 m/s v(final) = -7.3 m/s t = 0.0115 s Calculate a. 3. The attempt at a solution I used v(final ) = v(initial) + at and got a = 1533 m/s^2. Should the correct answer (rounded off to proper number of significant figures) be a = 1.53 X 10^3 m/s^2? What about 1533 m/s^2 or 1530 m/s^2….would either of these be acceptable OR is the only answer 1.53 X 10^3 m/s^2?