A spring with a spring-constant 2.9 N/cm is compressed 36 cm and released. The 7 kg mass skids down the frictional incline of height 27 cm and inclined at a 17 degree angle. The acceleration of gravity is 9.8 m/s2 .
The path is frictionless except for a distance of 0.8 m along the incline which has a coefficient of friction of 0.5.
What is the final velocity of the mass?