Two balls of masses m1 and m2 are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m1 travels a distance s1 and stops. If the coefficients of friction between the balls and ground are same, the mass m2 stops after travelling the distance 

(1) s2=m1m2s1

(2) s2=m2m1s1

(3) s2=m12m22s1

(4) s2=m22m12s1

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