Question

A particle of mass $m=5$ units is moving with uniform speed $V=3\sqrt{2}$ units in the XY plane along the line $Y=X+4$. The magnitude of the angular momentum about origin is:

• A. Zero
• B. $60$ units
• C. $7.5$ units
• D. $40$ units

Answer 1

Answer: (B)

$60$ units

$L=mvr$

$=5\times 3\sqrt{2}\times 4\times cos{45}^o$

$=60\sqrt{2}\times \frac{1}{\sqrt{2}}$

$L=60units$