Physics
Force of impact is the force

When the objects meet
By the objects weight
None of these
By the speed of the object

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break
None of these
The material of which pipes are made contracts due to cold and so breaks

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