Hello! The answer to this would be 94m/s3 I believe. I’m not for sure with the units but in order to find the answer, you would need to use the equation Vf=VI+(a x t) you would plug in the numbers, so in you case you would plug in, Vf= 4m/s +(3m/s2 x 30s) and you would get solve. I’m so sorry that I’m not certain with the units but I hope this helps you understand! Good luck :)