A particle of mass is moving such that at time

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

A particle of mass

2 \text{ kg}

is moving such that at time

t

, its position, in meter, is given by

\vec{r}(t) = 5\hat{i} - 2t^2\hat{j}

. The angular momentum of the particle at

t = 2\text{s}

about the origin in

\text{kg m}^{-2} \text{s}^{-1}

is : (1)

-80\hat{k}

(2)

(10\hat{i} - 16\hat{j})

(3)

-40\hat{k}

(4)

40\hat{k}