Question

Write the dimension of (a/b) in the formula F=at+bx*2

Answer 1

Force: M1 L1 T(-2) 

so, dimensional formula of at and bt^2 is also M1 L1 T(-2) 
Means, [aT] = M1L1T(-2) 
SO, [a] = (M1 L1 T^-2)/T 
so [a] = M1 L1 T -3 

Same way for b, 
bt^2= force 
so b= force/t2 = m1 l1 t (-4)...