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An open knife of mass m is dropped from ...

An open knife of mass m is dropped from a height h on a wooden floor. If the blade penetrates up to the depth d into the wood. The average resistance offered by the wood to the knife edge is .

A

`mg(1+h/d)`

B

`mg(1+h/d)^(2)`

C

`mg(1-h/d)`

D

mg

Text Solution

Verified by Experts

The correct Answer is:
A
`F.d = mg(h+d)`
`F = mg(1+h/d)`
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