A 60-lb plank rests on two horizontal pipes AB and CD of a scaffolding. The pipes are 10 f...

A 60-lb plank rests on two horizontal pipes AB and CD of a scaffolding. The pipes are 10 ft apart, and the plank overhangs 2 ft at each end. When pipe CD suddenly breaks, a 140-lb worker is standing on the plank at a distance x from pipe AB. Calculate and plot the initial acceleration of the worker for values of x from 0 to 10 ft.