A boxcar of mass 125 tons at rest becomes uncoupled on a 1.3 degrees grade. If the track is considered to be frictionless, what speed does the boxcar have after 11.93 seconds

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.