A cube with a mass of 30kg is lifted by a constant force to a height of 10m in 5s. If the initial velocity of the body is zero and the acceleration of gravity is g =9.8m / s2, what is the value of the mechanical work done by this force?

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.