The penetration depth of a test projectile fired into a block of ballistic clay is directly proportional to its kinetic energy just before impact.
When the projectile is fired with an initial speed of 150 m s-1, it penetrates to a depth of 18.0 cm.
What is the penetration depth of the same projectile, under identical target conditions, if its initial speed is increased to 250 m s-1?
25.0 cm25.0\text{ cm}25.0 cm
30.0 cm30.0\text{ cm}30.0 cm
50.0 cm50.0\text{ cm}50.0 cm
83.3 cm83.3\text{ cm}83.3 cm
