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In a fluid at rest, any tangential (shear) force would cause the fluid to flow due to its inability to resist shear stress. According to Newton’s third law, if a tangential force existed, the fluid would exert an equal and opposite force, leading to motion. Since the fluid is at rest, no such motion occurs, and the force must be normal to the surface.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.
Relative to ground: anet=ajump+alift=7+(−3)=4m/s2 upward. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 840 N as the result, so option C is correct.
Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Motion Parameters and Calculations
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