text: "push to 7m" or is that push through 7m\n\nif you are pushing against gravity  the force required is mass*acceleration due to gravity, which is 7*9.8 = 68.6 newtons\n\nHowever we are making two assumptions here, \n1. that acceleration due to gravity is constant at 9.8, which is only true at sea level at the equator, and is different everywhere else, 10m/s^2 at the poles for instance. Moreover g changes negligibily during the course of the movement through that 7 m also. \n2. resistance due to friction, air resistance are completely absent\n\nIt is also important to note that once a force slightly greater than 68.6 newtons is applied, the body starts moving upwards and keeps moving until an opposing force is applied. so to move through exactly 7m, u need to apply a force in the opposite direction to stop the object