a horizontal force of 1.2kgf is applied to 1.5kgf of block which rest on surface such that it just begin to slide .if coefficient of friction is 0.3.find out acceleration

Answer 1

netforce= mass*a
pushing force- frictionforce= mass*a

Now what is kgf?

Answer 2

http://en.wikipedia.org/wiki/Kilogram-force Frankly, if I were you, I would work it in SI