The acceleration of an object as a function of time is

Question

Question: The acceleration of an object as a function of time is given by a(t)=(2.77m/s³), where t is in seconds. if the object is at rest at time t=0.00s,

Part A: Calculate the instantaneous velocity of the object at time t=4.50s?

I need help to find the instantaneous velocity of the object at time t=4.50s.