1.

A body of mass 50 kg is projected vertically upwards with velocity of 100 m/sec. 5 seconds after this body breaks into 20 kg and 30 kg.  If 20 kg piece travels upwards with 150 m/sec, then the velocity of other block will be            [RPMT 1999]

A.          15 m/sec downwards    
B.          15 m/sec upwards
C.          51 m/sec downwards    
D.          51 m/sec upwards
Answer» B.          15 m/sec upwards


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