Multiple choice

A vertical PQ of length L is fixed at its top end P and has a flange to the bottom end Q. A weight W is dropped vertically from a height h (<L) on to the flange. The axial stress in the rod can be reduced by

  1. increasing the length of the rod

  2. decreasing the length of the rod

  3. decreasing the area of cross-section of the rod

  4. increasing the modulus of elasticity of the material
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