Question

A new particle, the joelon, has just been discovered! Careful measurements show that the joelon has an average lifetime (at rest) of 37 ns. How fast must an average joelon be moving to travel 24 m (as viewed from the lab frame) before it decays?

Answer 1

Well
`s=(d)/(t)` where s is speed, d is distance and t is time.

We have distance and time so we can calculate speed.

`s=(24)/(37\cdot10^(-9))\approx6.5\cdot10^8\frac{\mathbf{m}}{\mathbf{s}}\approx\boxed{6.5\cdot10^2\frac{\mathbf{Mm}}{\mathbf{s}}}`

Hope this helps.

r3t40