Please help really easy

I am sure it is A because no chemical change occurs and it is a physical change.  If you can Brainllest than that would be great but if you wanna you don't have to. Hope this helps!! If wrong sorry.

Explanation:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg