A 20gm bullet whose specific heat is 5000 J / (`kg-.^(@)C`) and moving at 2000 m/s plunges into a `1.0` kg block of wax whose specific heat is 3000 J /(`kg-.^(@)C`). Both bullet and wax are at `25^(@)C` and assume that (i) the bullet comes to rest in the wax and (ii) all its kinetic energy goes into heating the wax. Thermal temperature of the wax in `.^(@)C` is close to
A. `28.1`
B. `31.5`
C. `37.9`
D. `42.1`
