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Hammer of mass M strikes a nail of mass’m’ with a velocity 20 m//s into a fixed wall. The nail penetrates into the wall to a depth of 1 cm. The average resistance of the wall to the penetration of the nail is |
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Answer» `((M^(2))/(M+m))xx10^(3)` `MV+ m (0) = (M+ m) V^(1)` `V = 20 m//s` From WORK Energy theorem, `1/2 (M+ m) V^(2)= f xx 1cm` `f=1/2 (M+ m)((Mxx20)/(M+m))^(2)` `f=(2M^(2))/(M+m)xx!)^(4)N` |
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