Newton's second law:
Weight is directed downward - negative.
Thrust is directed upward - positive.
Acceleration is directed upward - positive.
A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust.
(a) What is the rocket's initial upward acceleration?
(b) At an altitude of 5000 m the rocket's acceleration has increased to 6.0 m/s2. What mass of fuel has it burned?
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