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The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
Unless you work hard, you will not succeed. Here "Unless" is used as---
Unless you work hard, you won't pass. Here "Unless" is -----
Whenever a force acts on a body and the body undergoes a displacement, then