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The speed appears to be 400 miles an hour. If you meant 400 miles, the speed is 50 miles an hour.
Magnitude of momentum = (mass) x (speed)Mass = 50 kgSpeed = (400/50) meters per secondMagnitude of momentum = (50) x (400/50) = 400 kg-m/sec
Speed (m/s) = Distance (m) / Time (s)Speed = 400 / 50Average Speed = 8 metres per second
Watch closely, and take notes:400/5 = 80 miles per hour.? ? ?
66 & 80 kph respectively