1.

Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is                                                                                                              [CPMT 1999; JIPMER 2000; RPET 2001]

A.          \[2s\]                             
B.          \[4\,s\]
C.          \[2\sqrt{3}s\]                 
D.          \[t=\frac{{{\nu }_{1}}-{{\nu }_{2}}}{a}\]
Answer» C.          \[2\sqrt{3}s\]                 


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