Question

we launched a solid of mass m on an inclined slide. The natural length of the spring is Lo. Before launching, the spring is compressed to a length L. After launching the center of mass of the solid reaches the point A of altitude Z with velocity v. Neglect friction.
a) Determine the relation among Lo, L, m, v, Z, g, and the constant k of the spring.
b) Calculate k if the maximum altitude reached is 20cm. take m= 600g, Lo=25cm and L=20cm

Answer 1

mgZ=max potential energy when stopped
1/2 m v^2= initial KE
1/2 k (Lo-L)^2=KE of spring
InitialSpringEnergy=InitialKE=FInalPE

Answer 2

in part b we do G.P.E=E.P.E ?