Intro to Forces + Newton's Laws Video Lessons

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Problem: 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?

FREE Expert Solution

Newton's second law:

ΣF=ma

(a)

Weight is directed downward - negative.

Thrust is directed upward - positive.

Acceleration is directed upward - positive.

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Problem Details

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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