Yes minerals are flammable. I almost caught my shirt on fire onetime
I don't know for sure but i think that it is because the force him pushing her pushed him back as well
Hope i helped
Answer:0.302
Explanation:
Given
mass of crate m=27 kg
Force required to set crate in motion is 80 N
Once the crate is set in motion 56 N is require to move it with constant velocity
i.e. 80 N is the amount of force needed to just overcome static friction and 56 is the kinetic friction force
thus

where
is the coefficient of static friction and N is Normal reaction





Answer:
The answer is the 3rd option!