Question

A shot fired with a velocity V₁ on a mud wall is able to pierce 4 cm thickwall. The same shot fired at V₂ pierces 9 cm thickness of an identical wall. Compare V₁ and V₂ assuming the resistance offered by the walls to remain same.

Answer 1

Let F be the resistive force offered to the shots. 

Work done against the force = Initial K.E.