Answer:
I mean this is what I think
Explanation:
you would need to place a rock on top of each other until you reach the ceiling
It seems logical to me
Compare the initial mass to the final mass.
The measuring devices for mass is scales and Balances
Answer:
1. Friction enables us to walk freely.
2. It helps to support ladder against wall.
3. It becomes possible to transfer one form of energy to another.
4. Objects can be piled up without slipping.