Question

5. An open knife edge of mass 200 g is dropped from
height 5 mon a cardboard. If the knife edge penetrates
distance 2 m into the cardboard, the average resistance
offered by the cardboard to the knife edge is
(a) 7 N
(b) 25 N
(c) 35 N
(d) None of these​

Answer 1

Answer:

7 N

Explanation:

F = mg(h+d)÷d

F= 0.2×10(2+5)÷2=7

7N