.The distance between the 3rd and 6th nodes (3 sections) on a standing 2 points wave of a tuning fork is 82 cm. If the frequency of the waves is 32Hz, what
is the temperature in the room?

Answer:   [a]:   "slate" .

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.