19. a small dog is trained to jump straight up a distance of 1.2 m. how much kinetic energy does the 7.2-kg dog need to jump this high? (the acceleration due to gravity is 9.8 m/s2.) show your work for credit.

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.