If the water from the exhaust of the pump in Problem 3 are used to supply water to an apartment complex, how high the water can be pumped before its pressure reaches 100 kPa, with the same velocity? A ball with mass m = 2 kg is attached to the free end of a linear spring with spring constant k = 10,000 N/m. The ball is pulled and the spring is stretched from its rest state by 100 mm. If we let the spring go, what will be the speed of the ball when it reaches 20 mm away from the rest state of the spring, as well as when it reaches the rest state of the spring. Assume that there is no friction, and the potential energy of the spring is converted into kinetic energy of the ball. The torque generated by an electric motor is T = 25 Nm. If the shaft speed is 6000 rpm (revolution per minutes), what is the shaft power in kW.