GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Accelerate upwards at 9.8 m/s2
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Travel at a constant velocity
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Travel at the escape velocity of Earth
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go in orbit around a large star
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Detailed explanation-1: -A rocket provides the means to accelerate a spacecraft. Like an airplane’s jet engine, a rocket creates thrust by expelling mass to take advantage of Sir Isaac Newton’s third law (see above).
Detailed explanation-2: -Even though the force of gravity is still very much in effect, astronauts in orbit do not feel it because they’re in a constant free fall.
Detailed explanation-3: -When an object is thrown vertically upwards, the acceleration due to gravity remains unchanged and acts in downward direction.
Detailed explanation-4: -The acceleration g varies by about 1/2 of 1 percent with position on Earth’s surface, from about 9.78 metres per second per second at the Equator to approximately 9.83 metres per second per second at the poles.