a) A K+ meson is created in a lab and decays into two 7 mesons in its own rest frame with its life time 12.4ns. How fast is it travelling in the laboratory if it moves a distance of 10.0m before decaying? (b) For some arbitrary function f check the Lorentz invariance of (i) Schrdinger's equation, (ii) Wave equation, (iii Klein-Gordon equation.