Motion in a Plane · Motion in a plane – kinematics

The position of an object having mass 0.1 kg as a function of time

t

is given as

\vec r = \left(10t^2\hat i + 5t^3\hat j\right)

m. At

t = 1

s, which of the following statements are correct?

A.	The linear momentum $\vec p = \left(2\hat i + 1.5\hat j\right)$ kg.m/s.
B.	The force acting on the object $\vec F = \left(2\hat i + 3\hat j\right)$ N.
C.	The angular momentum of the object about its origin $\vec L = 15\hat k$ J s.
D.	The torque acting on the object about its origin $\vec\tau = 20\hat k$ N m.

Choose the correct answer from the options given below.

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