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प्रश्न
A book resting on a table is being pushed upwards by the table. What is this upward force called?
विकल्प
Muscular force
Normal reaction force
Gravitational force
Friction force
MCQ
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उत्तर
Normal reaction force
Explanation:
This is the contact force exerted by a surface that acts perpendicular to it, preventing an object from falling through.
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