Two identical point charges in outer space are held apart at a distance d. as soon as the charges are released, each begins moving at an acceleration a. if instead they were released at a distance d/2, the acceleration of one charge would be
a. 2a
b. 4a
c. a/2
d. a/4

Ithink the answer would be a 

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.

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.

They all deal with hard evidence(scientific)