Using conservation of energy, find the kinetic energy at the top of the loop. Express your answer as a function of k, m, x, g, and r.
a) 0.5⋅k⋅m⋅(x²)⋅(g² )⋅(r²)
b) 0.5⋅k⋅m⋅(x²)⋅(g² )
c) 0.5⋅k⋅m⋅(x²)
d) 0.5⋅k⋅m⋅(g² )⋅(r²)