2. The displacement x of a particle is dependent on time t according to the relation : x = 3-5t+2...

2. The displacement x of a particle is dependent on time t according to the relation : x = 3-5t+2t². If t is measured in seconds and x in metres, find its
(i) velocity at t =2s and
(ii) acceleration at t = 4s
[Central Schools 13]