A body of mass 
is dropped from a height 
on a sand floor. If the body penetrates 
cm into the sand, the average resistance offered by the sand to the body is
a)
b)
c)
d)
A body of mass is dropped from a height on a sand floor. If the body penetrates cm into the sand, the average resistance offered by the sand to the body is
a)
b)
c)
d)
Question ID - 51844 | SaraNextGen Top Answer
A body of mass is dropped from a height on a sand floor. If the body penetrates cm into the sand, the average resistance offered by the sand to the body is
a)
b)
c)
d)
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A body of mass |
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b) |
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c) |
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d) |
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1 Answer
127 votes
Answer Key / Explanation : (b) -
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(b) If the body strikes the sand floor with a velocity With this velocity
Work done by all the forces is equal to change in KE
or |
, then 
, when body passes through the sand floor it comes to rest after travelling a distance 
Let 
be the resisting force acting on the body. Net force in downwards direction
or 
127 votes
Answer Link
127