In the following diagram, the counter-clockwise torque is equal to

10 nm
80 nm
400 nm
500 nm

400 Nm

Explanation:

Moments are given by multiplying force and distance

Taking moments where the pivot is locate

The counter-clockwise moment is given by 100*5= 500 Nm (It moves against the normal direction of the clock considering the pivot location)

Clockwise moments is given by 40*2= 80 Nm (Moment moves in the direction of clock considering pivot location)

answer: point c: b. 1/2 potential, 1/2 kinetic, point a: 3/4 of its potential energy, point d or b: 3/4 potential, 1/4 kinetic

explanation: i cant explain. it's difficult to explain.