Question

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

• A. Zero
• B. 60 unit
• C. 7.5 unit
• D. 40 $\sqrt { 2 }$ unit

Answer 1

Answer: (B)

60 unit

Answer 2

v = $\sqrt { \frac { \mathrm { T } } { \mu } }$ = $\sqrt { \frac { 1.6 \times 0.4 } { 10 ^ { - 2 } } }$ = 8 m/s

S = vt = 0.8 = 8 Dt Ž Dt = 0.1 sec