a horse has an acceleration of 2 m/s. of it starts from rest . how fast is it going after 1.7 seconds

Speed = (acceleration) x (time) Speed = (2 m/s²) x (1.7 sec)  =  3.4 m/s .

u = 0 a= 2 m/s^2 t = 1.7s v = u + at = 0+2×1.7= 3.4 m/s^2