What can we say about the current in LCR series resonance?

A particle moving along a straight line path reverses its direction of motion twice. What can we say about the nature of its acceleration?

A particle moving along a straight line reverses its direction of motion once. What can we say about the nature of its acceleration?

If q_1 q_2 > 0 , what can one say about the sign of the charge?

What can you say about the motion of object whose distance - time graph is a straight line parallel to time axis ?

For the current in LCR circuit to be maximum.

What can you say about each of the interior opposite angles, when the exterior angle is an obtuse angle?

What can you say about the motion of an object if its speed - time graph is a straight line parallel to time axis ?