What you need to know is that the force is
F=ma
The force is the product of mass and acceleration
this means that the acceleration is
a=F/m
a) The force is halved?
this means that f will be \(\frac{F}{2}\) now:
a=\(\frac{F}{2m}\)
So the accelaration will also he halved (it's the original acceleratation divided by 2)
b) The object's mass is halved?
a=\(\frac{F}{m/2}\)=a=\(\frac{F2}{m}\)
which is the original acceleration times two!! so it will double
c) The force and the object's mass are both halved?
now we have
a=\(\frac{F/2}{m/2}\)=a=\(\frac{2F}{2m}\)=a=\(\frac{F}{m}\)
so they will cancel each other out and the acceleration will stay the same!
