# Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 2 - Force and Laws of Motion

Question 62 Exercise

A girl weighing 25 kg stands on the floor. She exerts a downward force of 250N on the floor. What force does the floor exert on her?

The force exerted by the girl downward = 250N = force exerted by the floor According to the third law of motion, every actin as an equal and opposite reaction.

a = F/m

Video transcript
"kids welcome to lido q a video i am vinit your leader tutor glad to bring you this question on your screen a girl weighing 25 kg stands on the floor c exerts a downward force of 20 to 50 newton on the flow what force does the floor exert on her now if you recall newton's third law of force newton's third law of motion what does it say do you remember so according to newton's third law of motion every action has an equal and opposite reaction right equal and opposite reaction now by this law whatever force the girl is exerting on on on the downward direction the same force will be exerted by the wall or the flow right in the opposite direction therefore force exerted by the floor will be equal to 250 newton in upward direction right so that's the answer guys so if you still have a doubt please leave a comment below do like the video and subscribe to our channel i'll see you in our next video until then bye guys keep learning "
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