On a longitudinal wave, in which areas are particles farthest apart? ___ A. crests
B. troughs
C. rarefactions

It is d, all the other ones say incorrect answer .

Since the pully is a simple machine so the mechanical advantage is a 1

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.

Anton because carbon dioxide and water are used with light energy to produce glucose sugar and oxygen gas.