A spring with a spring-constant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ 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 0.3.
k = 2.2 N/cm
What is the final velocity vf of the mass? Answer in units of m/s
Final K.E. = (spring potential energy) +
(gravitational P.E. loss) - (friction work done)
Get the final velocity from the final K.E.