You throw a softball (of mass 400 g) straight up into the air. it reaches a maximum altitude of 17.3 m and then returns to you. what is the gravitational potential energy of the softball at its highest position? assume the ball departed from and returned to ground level.

M=400/1000=0.4kg          h=17.3             g=9.8m/s2                                                               P.E=mgh                                                                                                              P.E=0.4(9.8)(17.3)                                                                                                  P.E=67.8J