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Question

A rocket weighing 9000 N fired vertically upward. The gases are expelled at a rate of 20Kgs1 with a speed of 0.5 km/s. If the rocket weighs 6000 N at the burn out, them the net upward force n the rocket at fire off should be
  1. 103N
  2. 104N
  3. 105N
  4. 106N

A
105N
B
103N
C
106N
D
104N
Solution
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