A 2kg particle moves with velocity v\=4i^+5j^m/s at r\=−3j^m. What is the z-component of its angular momentum?

Practice question

Question

A 2kg particle moves with velocity v\=4i^+5j^m/s at r\=−3j^m. What is the z-component of its angular momentum?

Options

Choose one · Correct answer highlighted

10 kg m²/s 12 kg m²/s Correct 14 kg m²/s 16 kg m²/s

Explanation

L = r×p = |i^j^k^0−30450| = k^(0×5−(−3)×4) = 12k^kg m2/s. Z-component = 12kg m2/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 12 kg m²/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

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