Question

The position of a particle is expressed as
r= (2t)î+(t)jm ,where t is time in second. The
coordinates of particle at t = 2 s is
(1) (1 m, 2 m)
(2) (2 m, 3 m)
(3) (1 m, 1 m)
(4) (4 m, 2 m)

Answer 1

Answer:

(4m, 2m)

Explanation:

t = 2s

r = ((2t)î+(t)j) m

putting t = 2 in r we get,

r (2s) = (4m î + 2m j)

î and j represent x - axis and y- axis respectively .

So, Along x axis, 4m and along y axis, 2m

And the correct answer is (4m, 2m)