No links please, PLEASE HELP NOW!!! I just don’t understand how to do this problem

(A) Find the velocity and acceleration as functions of t.

Velocity, in meters per second at time t: _

Acceleration, in meters per second, per second, at time t: _

(B) Find the acceleration after 1 second.

Acceleration, in meters per second, per second, after 1 second: _

(C) Find the acceleration at the instant when the velocity is 0.

Acceleration, in meters per second, per second: _