Question

what wll be the change inn accelertion of a sliding block, if its mass is doubled while a constant force is acting on it?

Answer 1

From Newton's second law of motion, $F=m\times a$
or, $a=\frac{F}{m}$
It means, that the acceleration produced in an object is inversely proportional to the mass of the object. If the mass of the object is doubled while a constant force is acting on it, its acceleration will be halved of its original value.