6. A Mk-83 laser guided bomb is being used to attack an SA-6 mobile SAM site. The Mk-83 warhead casing weight is 250 kg and is "scored" to produce 10,000 fragments. The SAM site can withstand at least 10,000 Joules of energy before fragment penetration. What fragment velocity is required to achieve fragment penetration against the SA-6 mobile target?