C.an equal and opposite reaction
There are 3 iron atoms per molecule of iron oxide.
When you hold the ball, you have potential energy, when you drop the ball, you have kinetic.
Answer:
0.2
Explanation:
Horizontal force=100N
Weight of crate=500 N
We have to find the coefficient of kinetic friction.
Normal ,N=Weight=500N
Horizontal force,
Where
=Horizontal force
N=Normal force
=Coefficient of kinetic friction
Substitute the values in the formula


Hence, the coefficient of kinetic friction =0.2