The depth of penetration of a research projectile into a block of uniform ballistic gel is directly proportional to its initial kinetic energy.
The projectile is fired at a speed of 150 m s-1 and penetrates to a depth of 9.0 cm.
What is the depth of penetration of the projectile, under the same conditions, when its initial speed is 250 m s-1?
15 cm15\text{ cm}15 cm
25 cm25\text{ cm}25 cm
30 cm30\text{ cm}30 cm
42 cm42\text{ cm}42 cm
