4. A plane undergoes a change in momentum of 2,000 Nm over the course of a 1 hour
flight. What is the average force that is acting on the plane during that time?

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg