A piston 3 kg in mass is sliding down in a cylinder due to gravity as shown in Figure P2.37. The gap between the piston and cylinder is filled with oil with a viscosity of 0.29 kg/m-s. The piston...

A piston 3 kg in mass is sliding down in a cylinder due to gravity as shown in Figure P2.37. The gap between the piston and cylinder is filled with oil with a viscosity of 0.29 kg/m-s. The piston diameter is 15 cm and the clearance between the piston and the cylinder is 0.4 mm. Determine whether the piston is accelerating or decelerating when it is moving with a speed of (a) 5 m/s, and (b) 0.5 m/s.