Answer:
Momentum is conserved.
All of the others are not conserved because of heat loss caused by deformation, etc.
kinetic energy into potential energy.
when the rocks go down it will be kinetic energy but when the rock reach the bottom of the hill it will be converted into potential energy.
Answer:
decreases
Explanation:
The angular frequency of the mass is given by

where, k is the spring constant and m be the mass of the body which is doing oscillations.
if the mass of the body increases, so the value of angular frequency decreases, as the angular frequency is inversely proportional to the square root of the mass of the body.
1. Li3N lithium nitride
AND
3.SO2 sulfur dioxide