A 3 kg medicine ball has a GPE of 150 J. How high above the floor is the medicine ball being held? 5.1 m
10 m
29.4 m
120 m

Transfer of electrons. hope it !

Answershe should not have multiplied the sulfur atoms by the subscript 4

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared. 

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.