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For a single body in pure translational motion, the velocity of the center of mass is the same as the velocity of the body. Given: v = 2m/s. Thus, V = 2m/s (direction along the incline).
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Potential energy mgh=1.5×10×12=180J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 15 m/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics > Chapter 6: Work, Energy and Power > Topic: Work, Energy and Laws of Motion - Mixed Practice
Constant speed: mgsinθ=fk, fk=μkN, N=mgcosθ. 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 2.94 N as the result, so option B is correct.
Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0
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