Question

Question.
Polymers are known to contract and expand with a decreases and increase in
temperature (respectively). With every 5°C decrease in temperature, the length of a
polymeric rod decreases by Smm, and with every 5°C increase in temperature, its
length increases by 10 mm.
A rod was taken at room temperature. Its temperature was first lowered to 20°C
below room temperature and its length was noted down. Its temperature was then
increased to 15°C above room temperature and its length was again noted down.
What was the difference between the lengths of the rod that were noted down at the
beginning and end of the experiment.
(A) 17mm
(B) 51mm
(C) 52 mm
(D) 2 mm​

Answer 1

Answer:

c is the answer please make me brainlist