Question

A 2kg rock has velocity 12 ms^-1 what at point P as shown in Fig. Find the angular momentum about point D.

• A. 115.2 kg m²s^-1
• B. 125.2 kg m²s^-1
• C. 135 kg m² s^-1
• D. None

Answer 1

Answer: (A)

115.2 kg m²s^-1

Answer 2

L = mv × perpendicular distance = 2 × 12 × 8 × $\frac{3}{5}$

= 115.2 kg m² s^-1