Take the Mechanical Equivalent of Heat as 4 J/cal

Multiple Choice

Take the mechanical equivalent of heat as 4 J/cal.A 10-gram bullet moving at 2000 m/s plunges into 1 kg of paraffin wax (specific heat 0.7 cal/g .°C) .The wax was initially at 20°C.Assuming that all the bullet's energy heats the wax, its final temperature is:

A) 20.14 °C
B) 23.5 °C
C) 20.006 °C
D) 27.1 °C
E) 48.6 °C