Question

Please answer quick

The man is sitting on a bench. His mass exerts a force of 720 newtons down against the bench. What force does the bench exert against the man?


A. 0 N up

B. 360 N up

C. 720 N up

D. 1440 N up

Answer 1

C. 720 N up

Step-by-step explanation:

Newton's third law states that:

"When an object A exerts a force on an object B, then object B exerts an equal and opposite force on object A"

In this situation, we can imagine the man to be object A and the bench as object B. The force exerted by the man on the bench is:

720 N, down

So according to Newton's third law, the bench must exert an equal and opposite force on the man. Therefore, the force exerted by the bench must be

720 N, up