Answer:
Normal force=mg
Explanation:
The reaction force of weight is the normal force.
in order to find the normal for we need to write all the forces and set it equal to the net force:
N-mg=ma (since it is a constant speed the a=0)
N=mg
Answer:
1000m/s
Explanation:
velocity(v)=momentum(p)/mass
=100/.1
=1000m/s
No additional force is required because it's already going downhill
Answer:
49.6°
Explanation:
= Unpolarized light
= Light after passing though second filter = 
Polarized light passing through first filter

Polarized light passing through second filter

The angle between the two filters is 49.6°