As a result of a nuclear interaction a K∗+ particle is created which decays to a K meson and a π− meson with rest masses equal to 966 me and 273 me respectively. From the curvature of the resulting tracks in a magnetic field, it is concluded that the momentum of the secondary K and π mesons are 394 MeV/c and 254 MeV/c respectively, their initial directions of motion being inclined to one another at 154◦. Calculate the rest mass of the K∗ particle
