Given
Mass of car A, m=1200 kg
Speed of car A, u=15 m/s
Speed of car B, u'=0
After collision,
Speed of car A, v=0
Speed of car B, v'=15m/s
To find
Mass of the car B
Step-by-step explanation
Let the mass of B be m'
By conservation of momentum
Conclusion
The mass of B is 1200 kg
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