Choose the incorrect statement

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For a person climbing up a hill, the centre of mass should be shifted forward by leaning forward

For a person getting down a hill ,the centre of mass should be shifted backward by leaning back

For stability of a ship, it is loaded by cargo at its base

For stability of double decker, it is advised to fill the upper portion first and then lower portion

answer is D.

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Detailed Solution

Let us review the given options.

A) When a person is climbing up a hill to avail force to move up he should lean forward so his centre of mass will shift forward.

B) When a person is getting down a hill to balance the descending force he should lean backward. So his centre of mass, will shift backward.

C) To set a ship stable we advise to fill the cargo at base. So that centre of mass will remain closer to surface of contact and increases stability of ship.

D) When you fill upper portion of double decker bus then it will be heavier than lower portion and C.M of the bus will raise up from surface of contact make the bus to topple.

So it is not correct to fill the upper portion first.

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