A force F is given by F = at + bt², where t is time. What are the dimensions of a and b?

Q. A force F is given by F = at + bt², where t is time. What are the dimensions of a and b?

1. MLT-1 and MLT0
2. MLT-3 and ML2T4
3. MLT-4 and MLT1
4. MLT-3 and MLT-4

Answer: MLT-3 and MLT-4