Question

(a) State second law of motion. Give its mathematical expression. (b) How will you define unit of force using this law? (c) Calculate the mass of a body. When a force of 525N produce an acceleration of 3.5m/s square.

Answer 1

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object

mathematicaly,
F=ma

therefore SI unit of force from the above expression is......
F= kg m/s²


F=ma
m=F/a
m=525/3.5
m= 150 kg



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and there is a correction in your question.... acceleration si unit is m/s² not m/s.....

Answer 2

(a) For a object of constant mass m, the second law states that the force f is the product of the object's mass and it's acceleration. 
It is denoted by f=m*a.
(b) The SI unit of force is Newton(N). It can be defined as the force which is applied on a body of mass 1kg and having an acceleration of 1$ms^{-2}$.
(c) f=ma
m=f/a
m=525/3.5=150 kg.