The momentum of the body is obtained as 10800 Kgm/s.
The momentum of the body could be obtained from the equation given as; p=mv
p = momentum
m = mass of the body
v = velocity
m = 1200-kilogram (kg)
v = 9 meters per second (m/s)
p = 1200-kilogram * 9 meters per second
p = 10800 Kgm/s
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