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Why is the pressure on the ground more w...

Why is the pressure on the ground more when a man is walking than when he is standing?

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How much pressure will man of weight 80kg f exert on the ground when (i) he is lying and (ii) he is standing on his feet ? Given that the area of the body of the man is 0.6 m^(2) and that of a foot is 80 cm^(2).

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MBD -HARYANA BOARD-GRAVITATION-Example
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  14. What is the SI unit of weight ?

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