Answer
See explanation.
Work Step by Step
The maximum lifetime of the particle is given by the uncertainty principle.
$$\Delta E \Delta t = \frac{\hbar}{2}$$
$$\Delta t = \frac{\hbar}{2\Delta E}=4.20\times10^{-25}s$$
The approximate range of the force is how far the meson could travel in its lifetime, which is limited by the speed of light, c.
$$c\Delta t=1.26\times10^{-16}m$$
