Practice question

Given: A 5 kg particle moves with velocity v = 4 i m/s at r = -3 j m . What is the magnitude of its angular momentum about the origin? These values define the system as per NCERT data. Formula: L = r × p = beginvmatrix i & j & k 0 & -3 & 0 4 & 0 & 0 endvmatrix = k (0 × 0 - (-3) × 4) = 12 k kg m²/s. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Magnitude = 12 kg m²/s . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.