Answer:
Part a)
Velocity = 6.9 m/s
Part b)
Position = (3.6 m, 5.175 m)
Explanation:
Initial position of the particle is ORIGIN
also it initial speed is along +X direction given as

now the acceleration is given as

when particle reaches to its maximum x coordinate then its velocity in x direction will become zero
so we will have



Part a)
the velocity of the particle at this moment in Y direction is given as



Part b)
X coordinate of the particle at this time



Y coordinate of the particle at this time



so position is given as (3.6 m, 5.175 m)