Problem: An object of unknown mass moving at 87 m/s collides with another object whose observed mass and momentum allow us to conclude that the momentum of the first object was 2784 kg m/s. What is the mass of the first object?
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Solution: What all this boils down to is that an object with velocity 87 m/s has momentum 2784 kg m/s, and we are to find its mass. Since momentum is the product of mass and velocity, the mass is the momentum divided by the the velocity. The mass is thus ( 2784 kg m/s)/( 87 m/s) = 32 kg.
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