Answer:
2.1844 m/s
Explanation:
The principle of conservation of momentum can be applied here.
when two objects interact, the total momentum remains the same provided no external forces are acting.
Consider the whole system , gun and bullet. as an isolated system, so the net momentum is constant. In particular before firing the gun, the net momentum is zero. The conservation of momentum,

assume the bullet goes to right side and the gravitational acceleration =10 
so now the weight of the rifle=

this is a negative velocity to the right side. that means the rifle recoils to the left side
They do it by followinng the centeral nervous system
Answer:
Explanation:
If two forces act on an object in the same direction, the net force is equal to the sum of the two forces.
The answer is C, because the water molecules are evaporating and the salt molecules are staying the same.