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The Helios probes are notable for having set a maximum speed record among spacecraft at 252,792 km/h (157,078 mi/h or 43.63 mi/s or 70.22 km/s or 0.000234c. (c is short for celerity and is shorthand for speed of light.)

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What does 'top speed' mean?

'Top speed' refers to the maximum speed that a vehicle or object can achieve under optimal conditions. It represents the highest rate of travel that can be reached by a particular vehicle or object.


What is the highest speed ever reached by a human?

in the summer Olympics of 2010 usain bolt ran a record of 19.9 miles an hourThat's not what the question asked. I believe the Highest speed ever reached by a human was Lee Evans at 28.3 mph. I'd be interested to see what Bolt would be clocked at by, say, a radar gun...


What is the greatest speed reached by a falling object?

The greatest speed reached by a falling object is known as terminal velocity. This is when the gravitational force pulling the object down is equal to the air resistance acting against it, resulting in a constant speed. Terminal velocity for a human falling through the atmosphere is around 120 mph (200 km/h).


A falling object that has reached its terminal speed continues to gain what?

A falling object that has reached its terminal speed no longer accelerates due to air resistance balancing the gravitational force. At terminal speed, the object continues to fall with a constant velocity and no longer gains speed.


What is the instantaneous speed of an object that is at its highest point when it is thrown stright up in the air?

The instantaneous speed of the object at its highest point is zero. At that moment, the object is at rest before it starts to fall back down due to gravity.


How can you measure when an object has reached terminal velocity?

Terminal velocity is reached when the forces of gravity and air resistance acting on an object are equal, causing the object to no longer accelerate. To measure when an object has reached terminal velocity, you can observe that the object falls at a constant speed without speeding up. This can be done by measuring the object's velocity as it falls and noting when it remains constant.


When a falling object stops speeding up and falls at a constant rate of speed that object has reached its?

When a falling object stops speeding up and falls at a constant rate of speed, it has reached its terminal velocity. Terminal velocity occurs when the force of air resistance equals the force of gravity acting on the object, resulting in a balanced and constant downward acceleration.


What is the land speed of a human?

the highest speed rate was 11 mph, but that was a world record


What is the highest speed possible for an object to travel?

The universal speed limit for material objects is c : the speed of light in a vacuum.


What is the instantaneous speed of an object that is at it's highest point when it is thrown straight up in the air?

The instantaneous speed of an object at its highest point when thrown straight up in the air is zero. At the highest point, the object has momentarily stopped moving upwards and is just about to start falling back down due to gravity.


What two-word term is the top speed reached by a free-falling object?

terminal velocity


What is the highest speed ever reached by a rocket?

That question is not very specific. The answer in general is the speed of light. A better question would be to specify what object or thing in respect to what, like what was the fastest speed ever achieved by a manned land vehicle.