00:01
Here given values the objective of the question is to find the position of the particles at a time t is equals to 4s.
00:14
If the velocity of the particles is v, v vector is equals to 2 cos bracket minus t e cap r meter per second.
00:30
The initial time is t is equals to 0s.
00:37
The initial position of the particles x is equals to 6m and y is equals to minus 12m.
00:52
Explanation, the question is an initial value problem.
00:56
The function value at any point can be found if any ordinary differential equation and the initial conditions are given.
01:06
Here the velocity is given in the polar form v vector is equals to 2 cos bracket minus t e cap r meter per second.
01:23
It can be written in the differential form as v vector is equals to dr upon dt e cap r plus rd nod upon dt.
01:50
The velocity vector has only one compound which is the r compound.
01:57
Then the theta component will be 0.
02:01
Then it is clear that d theta upon dt is equals to 0...