Question

physics question answer by writing it on a paper plzz​

Answer 1

first of all differentiate x with respect to time to get velocity and then differentiate velocity with respect to time to get acceleration and put acceleration less than zero and on solving you will get time less than 2.5 so the answer comes out to be as option 4 but the answer is not 3 because at t is equal to 2.5 acceleration will become zero