Assume the space shuttle's main engines produce 764,576 newtons of thrust, and the shuttle has a mass of 78,018 kg. why does the shuttle need the two solid rocket boosters (in addition to the main engines)?

With the given dimensions, it is important to note that the space shuttle is still in need of the two solid rockets because it has to be propelled in the outer space at specified speed which is only attainable if there has been initially a force applied to it prior it is sent to the outer space. 

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Mechanical energy from wind nonrenewable resource