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An open knife edge of mass 200 g is drop...

An open knife edge of mass 200 g is dropped from height 5m on a cardboard. If the knife edge penetrates distance 2m into the card board, the average resistance offered by the cardboard to the knife edge is `(g = 10m//s^(2))`

A

7 N

B

25N

C

35 N

D

None

Text Solution

Verified by Experts

The correct Answer is:
A
`u=sqrt(2gh),` using `v^(2)-u^(2)=2as` retardation due to air resistance `a^(1)=g+a`
Force due to air resistance = Ma
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