The correct option is C Both (a) and (b) are correct
At x=6 m,U=26 J
On the other side
U=26=10+(x−2)2
or x−2=±4
∴x=6 m
and x=−2 m
Thus x=+6 m and x=−2 m are the extreme positions. At x=2 m , potential energy is minimum, which is 10 J. Hence, at this position kinetic energy will be maximum, which is equal to total mechanical energy (=26 J) minus minimum potential energy (=10 J). Thus maximum kinetic energy is 16 J