9. How does a spacecraft leave the surface of the Earth?
*
1 point
a The spacecraft produced an upward force of thrust that was equal to the downward force of gravity.
bThe spacecraft produced an upward force of thrust that was greater than the downward force of gravity.
b The spacecraft produced a downward force of thrust that was equal to the downward force of gravity.
c The spacecraft produced a downward force of thrust that was less than the downward force of gravity.
b The spacecraft produced an upward force of thrust that was greater than the downward force of gravity.
The correct answer is: b The spacecraft produced an upward force of thrust that was greater than the downward force of gravity.
To leave the surface of the Earth, a spacecraft needs to overcome the force of gravity. This is typically done by producing an upward force of thrust that is greater than the downward force of gravity. So, the correct answer is:
b) The spacecraft produced an upward force of thrust that was greater than the downward force of gravity.