What affect does a quadrupling of the mass have a upon the acceleration of the object

When the body has mass m

The force on a body is given as

F=ma

a=F/m

Then,

When you the mass is quadruple

i. e M=4m.

Then, let assume you are applying the same force

Then, using F=Ma

F=4ma

a=F/4m

This shows that the acceleration is reduced by quarter it former values.