What is the net force on a falling 100-n barrel hitting a pavement with 5000 n of force?

4900 N

Explanation:

At the moment when the barrel hits the pavement, there are two forces acting on the object:

- its weight (force of gravity), pointing downward, of magnitude 100 N

- the reaction force (Newton's third law) exerted by the pavement on the barrel, pointing upward and of magnitude 5000 N (this is equal and opposite to the force exerted by the barrel on the pavement, which is also 5000 N)

Therefore, the net force on the barrel is:

a.

explanation:

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers