A small rocket with mass 20.0 kg is moving in free fall toward the earth. Air resistance can be neglected. When the rocket is 80.0 m above the surface of the earth, it is moving downward with a speed of 30.0 m>s. At that instant the rocket engines start to fire and produce a constant upward force F on the rocket. Assume the change in the rocket’s mass is negligible. What is the value of F if the rocket’s speed becomes zero just as it reaches the surface of the earth, for a soft landing? (Hint: The net force on the rocket is the combination of the upward force F from the engines and the downward weight of the rocket.)
A small rocket with mass 20.0 kg is moving in free fall toward the earth. Air resistance can be neglected. When the rocket is 80.0 m above the surface of the earth, it is moving downward with a speed of 30.0 m>s. At that instant the rocket engines start to fire and produce a constant upward force F on the rocket. Assume the change in the rocket’s mass is negligible. What is the value of F if the rocket’s speed becomes zero just as it reaches the surface of the earth, for a soft landing? (Hint: The net force on the rocket is the combination of the upward force F from the engines and the downward weight of the rocket.)
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A small rocket with mass 20.0 kg is moving in free fall
toward the earth. Air resistance can be neglected. When the rocket is
80.0 m above the surface of the earth, it is moving downward with a
speed of 30.0 m>s. At that instant the rocket engines start to fire and produce
a constant upward force F on the rocket. Assume the change in the
rocket’s mass is negligible. What is the value of F if the rocket’s speed
becomes zero just as it reaches the surface of the earth, for a soft landing?
(Hint: The net force on the rocket is the combination of the upward
force F from the engines and the downward weight of the rocket.)
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