55 kj of heat are added to 200 kg of a metal at 28.00◦c and the temperature rises to 29.18◦c. what was the metal? 1. copper (specific heat = 0.385 j/g · ◦ c) 2. tungsten (specific heat = 0.134 j/g · ◦ c) 3. lead (specific heat = 0.127 j/g · ◦ c) 4. silver (specific heat = 0.233 j/g · ◦ c)

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.