Movers must push a piano onto a truck, the bed of which is a height 1.76 m above the ground. To do this, they will use a frictionless ramp. If the piano has a mass of 1249.0 kg and the movers push it up the slope at a constant velocity, how much work do they need to do on it to move it into the bed? Please provide your answer in kilo-joules (KJ), as the amount of work should be quite large.