Shows the potential energy of a 500
g
particle as it moves along the
x
-axis. suppose the particle's mechanical energy is 12
j
.

figure
1 of 1
the figure shows the potential energy of a particle moving along the x-axis. the energy is measured in joules. there is a linear vertical potential barrier at x equal to 1 meter. for x from 1 to 4 meters the energy linearly increases from 2 to 8 joules. for x from 4 to 6 meters the energy linearly decreases to 0. for x from 6 to 8 meters the energy linearly increases to 12 joules and keeps growing for further distances.

part a
where are the particle's turning points?
express your answer using two significant figures. enter your answers in ascending order separated by commas.