More the mass, the more difficult it is to move the body from the rest. Explain this statement by giving an example.

Hint: Mass of an object is directly proportional to the inertia possessed by it. We know that anything which has more mass is difficult to move from its rest. Because its inertia resists the motion of an object. Hence, it’s tough to move from its rest state.
Complete answer:
More the mass is more difficult to move a loaded trolley rather than an unloaded one means to say is greater the mass more difficult to stop or move the body.
Example:
One bucket is filled with sand and the other is empty and initially, both buckets are at the state of rest. These buckets are pushed into a swinging motion when the bucket with sand would require more force because it has more mass or inertia.
Because a bucket filled with sand has a bigger mass compared to an empty bucket. The mass of the object which resists change in motion is directly proportional to the inertia. The Inertia will be increased when the mass is increased, and you need greater force to move or stop the heavier mass object.
Therefore, a body is difficult to move from rest because of having more mass i.e. because of inertia.

Note: The filled bucket has more inertia than the empty bucket because heavier or more massive objects offer larger inertia.
Inertia is a natural tendency of an object to resist a change in its state of motion and inertia is actually measured based upon the mass of an object.
The mass is solely dependent upon the inertia of an object. Similarly, the more inertia an object has the more mass.