Find Time in Physics: Ramp, Piano & Moving Van

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To determine how much time the workers have before the piano rolls down the ramp, a free body diagram is essential to analyze the forces acting on the piano. The height of the ramp is 1.4 m, and with an incline of 20 degrees, the length of the ramp can be calculated using trigonometry. The gravitational force will cause the piano to accelerate down the ramp, and using kinematic equations, the time can be derived from the distance and acceleration. Calculating these parameters will provide the exact time before the piano reaches the bottom of the ramp. Proper setup and analysis of the problem are crucial for finding the solution.
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A piano has been pushed to the top of the ramp at the back of a moving van. The workers think it is safe, but as they walk away, it begins to roll down the ramp.If the back of the truck is 1.4 m above the ground and the ramp is inclined at 20 degress, how much time do the workers have to get to the piano before it reaches the bottom of the ramp?

i have know idea how to set this problem up
 
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Draw freedody diagram and every thing will be clear
 

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