Answer:
The various
forces acting on the stone are:
(a) The
gravitational force exerted by the earth which pulls the stone downwards.
(b) The
force of reaction exerted by the ground on the stone vertically upwards.
(c) The
force of pushing exerted by the boy.
(d) The
force of friction exerted by the stone.
When a small
boy tries to push a heavy stone, then all these forces are balanced, and
therefore the stone does not move.
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