A boy stands on the ground. The area below his feet is 70 cm2. The pressure he exerts on the ground is 7 N/cm2. Calculate the total force acting on the ground.
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Solution
Area under the boy's feet = 70 cm2
Pressure exerted by the boy on the ground = 7 N/cm2
Total force acting on the ground = Pressure Area
Force = 7 70
= 490 N
Thus, the force exerted by the boy on the ground is 490 N.