Question

Tow movers unload a piano of mass 200. kg from a truck by using a ramp that is inclined at 35 degree above the horizontal. The coefficients of static and kinetic friction between the piano and the ramp are 0.40 and 0.35. respectively. One mover's cell phone rings and he asks the other mover to hold the piano in place during the call. What magnitude horizontal force must the second mover apply to keep the piano stationary? Fatigued after a few minutes he lets go of the piano and jumps out of the way. What is the piano's speed when it has slide 3.0. m. down the ramp? Follow up question: How wrong would the answer for the speed have been if friction has been neglected

Answer 1