a particle travelling in a straight line is subject to a retardation of initially 10 m/s^2 and increases uniformly with time to 13 m/s^2 3 seconds after the start. the initial speed of the particle is 100 m/s. find an expression for the acceleration of the particle in terms of t, the time taken and hence show that the time taken for the particle to come to rest is 10( √3 -1)s

I am not sure how to go about this.

maybe you have to use UVAST equations