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With what force does the floor push up on Jack's feet when he has a mass of 75 kg and is holding a bag of flour weighing 40 N?

A. 115 N
B. 155 N
C. 215 N
D. 275 N

Answer :

Final answer:

The floor pushes up on Jack's feet with a force equal to his total weight (including the bag), which is 775 N, according to Newton's third law's equal and opposite reactions. The given options do not have this correct answer.

Explanation:

The subject of this question is physics, specifically dealing with forces and Newton's laws. Jack's total weight would include both his weight and the weight of the bag he is carrying. We calculate weight by multiplying mass by the gravitational constant (9.8 m/s²). So, Jack's weight is 75 kg * 9.8 m/s² = 735 N. Adding the weight of the bag (40 N) to Jack's weight, we get a total of 735 N + 40 N = 775 N. This is the force with which Jack is pressing down on the floor.

According to Newton's third law, every action has an equal and opposite reaction. So, the floor pushes back up on Jack with an equal force. Therefore, the floor pushes up on Jack's feet with a force of 775 N. However, the options provided do not seem to include the correct answer. Please double-check the question and the given options.

Learn more about Physics - Forces here:

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