1.

A lead bullet at 27°C just melts when stopped by an obstacle. Assuming that 25% of heat is absorbed by the obstacle, then  the  velocity of the bullet at the time of striking (M.P. of lead = 327°C, specific heat of lead = 0.03 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)                    [IIT 1981]

A.            410 m/sec                              
B.            1230 m/sec
C.            307.5 m/sec                          
D.            None of the above
Answer» B.            1230 m/sec


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