Two charged particles exert an electrostatic force of 40 N on each other. What will the magnitude of the force be if the distance between the two particles is increased to twice the original distance?

Because its reliable.   there is no pollution  the chances of a radiation leak is low

If its history of, then b) because a) implies only present day (now)

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

The disturbance in a transverse wave is perpendicular to the wave motion.unlike a transverse wave, the disturbance in a longitudinal wave is parallel to the wave motion (a), that is, back and forth.