the potential energy of a 40-kg cannon ball is 14000 j. how high was the cannon ball to have this much potential energy? round off your answer to two decimal places.

On a test the graders have a mean of 77 and a standard deviation of 8. if we can approximate the distribution of these graders by a number distribution what percent of the students. a) scores higher than 77? b) should pass the test (grades > 60)? c) should fail the test (grades < 60)?