One ship, sailing east with a speed of 7.5 m/s, passes a certain point at 8 AmM; and a second ship sailing north at the same speed, passed the same point at 9.30 A. M. At what time are they
closest together and what is the distance between them then? ​

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.