Mike has a mass of 60 kg. he pulls on a wagon of mass 30 kg with a force of 20 n. the wagon remains motionless. the wagon exerts a force of on mike.
a.

45 n

c.

60 kg

b.

20 n

d.

20 kg

b. 20 N

Explanation:

Newton's third law of motion states that:

"when an object A exerts a force on another object B (action), object B exerts an equal and opposite force on object A (reaction)"

In this problem, we have Mike (we can think him as object A) that exerts a force of 20 N on the wagon (object B). Therefore, according to Newton's third law, the wagon must also exert an equal force (20 N) on Mike, in the opposite direction, regardless of the masses of the two objects.

So, the correct answer is

b. 20 N

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