Question

The position of a particle is given by
T = (3u - 2t^2j +1K) m, where t is time in second and
the coefficients have the proper unit for 1 to be in
metre. The acceleration of the particle (in m/s2) at
t=2 s is
(1) 2j
(2)-2j
(3)3i-2j
(4)-4j​

Answer 1

Answer: -4j

Explanation: r = 3t i -2t^2 j + 1k

V = 3i - 4t j

a = -4j