# Charged pion. GONE!

If a charged pion that decays in $${ 10 }^{ -8 }$$ seconds in its own rest frame is to travel $$30m$$ in the laboratory before decaying, what must the pion's speed be at least? SJPO 2010, Q42

Use Special Relativity to solve this.
Type your answer in $$m{ s }^{ -1 }$$.
Round your answer to 3 significant figures. Take the speed of light to be $$299792458m{ s }^{ -1 }$$

This question is part of my set SJPO Practice Questions

×