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Um.
Just Add "In the direction of the force acted" after writing product of mass and velocity... talking about Part a "momentum def"
now in part b.
Just write the "rattaa" howa 2nd law
If an external unbalanced force acts on an object it produces acceleration .this acc is directly proportional to the applied force.
than he is asking to show impulse is proportional to (means equal to) change in momentum
F=ma (2nd law)
break ... a = v-u/ t
substituite the break form of a in f=ma equation
In end you will get this
Ft = M(v - u )
and M (v - u) is the change in momentum so "Delta P"