Find the angular momentum about the origin when the

Question

A particle whose mass is 2.3 kg moves in the xy plane with velocity = (3.8 m/s)î along the line y = 4.8 m.

(a) Find the angular momentum about the origin when the particle is at (12 m, 4.8 m).

Magnitude = kg · m²/s

(b) A force = (-4.3 N)î is applied to the particle. Find the torque about the origin due to this force as the particle passes through the point (12 m, 4.8 m).

Magnitude = N · m