The position ofa particle is given byr=3.0hati-2.0t^(2)hatj+4.0hatkmwhere t is in seconds and the coefficients have proper units for r to be inmetres . (a)Find the v and a of the particle ? (b)What is the magnitude and direction of velocity of the particle at t=2.0s ?

The position ofa particle is given byr=3.0hati-2.0t^(2)hatj+4.0hatkmwh

1.	The position ofa particle is given byr=3.0hati-2.0t^(2)hatj+4.0hatkmwhere t is in seconds and the coefficients have proper units for r to be inmetres . (a)Find the v and a of the particle ? (b)What is the magnitude and direction of velocity of the particle at t=2.0s ?
Answer» Answer :(a) `v(t)=(3.0hati-4.0thatj)HATA(t)=-4.0hatj` (b) `8.54 " ms "^(-1),70^(@)` with X - AXIS.