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According to Einstein's theory of relativity the speed of gravity is equal to the speed of light; i.e. about 671 million miles per hour.
Note that this is still true in models for quantum gravity; there gravity is mediated by a massless particle and all massless particles have to travel at the speed of light.
If the object's propulsion system were to shut down at the surface of the earth, and there were
no air resistance, the object would have to be moving at about 25,150 mph (11.2 km/sec) at that
moment in order to escape earth's gravity and never return.
If the shut-down occurs at some altitude off the surface, the required speed is less.
If the propulsion system continues to burn long enough, the object can escape any any speed.
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Are speed and average speed different?
Yes, speed measures how fast an object is moving at a specific instant, while average speed refers to the total distance traveled divided by the total time taken. Speed can vary constantly, while average speed provides a single value for the entire duration of travel.
If a car travels 120 mph in 2.0 hours. What is the speed?
The speed of the car is 120 mph. Speed is a measure of how fast an object is moving over a specific distance, so regardless of the time taken to travel a certain distance, the speed of the car remains constant at 120 mph.
How fast does a skydiver fall?
A skydiver typically falls at a speed of about 120 mph (193 km/h) during freefall due to gravity. This speed is known as terminal velocity, when the force of air resistance balances the force of gravity acting on the skydiver.
How fast does the tvr cerbera speed 12 go?
The TVR Cerbera Speed 12 was claimed to have a top speed of over 240 mph (386 km/h) during its development. However, the car was never officially tested to achieve this speed.
How does an object's speed differ from its velocity?
Speed is a scalar quantity that measures the rate of motion of an object, while velocity is a vector quantity that includes both the speed and the direction of motion. Speed tells you how fast an object is moving, while velocity tells you how fast and in what direction it is moving.
How fast is 170 mph?
fast as a car speed
How fast does a fast ball have to be to be a fast ball?
69 mph It can be any speed but probably about 60 mph
How fast is 125cc engine speed in mph?
about 90 mph
How fast does a concord go?
maximum speed 1350 mph. cruise speed 1320 mph Over 600 MPH
How fast is 55 mph on a ATV in mph?
If an ATV is moving at 55 mph, then its speed is 55 mph. Both the original speed and the converted speed are the same.
What is the approximate speed limit in mph?
fast.
How fast is 30cc engine in mph?
Speed
What is the running speed of a polar bear?
fast fast
How fast is the Average speed of a goldfish?
25 mph
Where V2 rockets fast?
Maximum speed 3580 mph. Impact 1790 mph
How fast a Model T can go?
The top speed was around 45 mph. Cruising speed was 35 to 40 mph.
How fast was the Apollo ship flying to the moon in mph?
The Apollo spacecraft traveled to the moon at an average speed of around 36,000 mph. This incredible speed was necessary to escape Earth's gravity and reach the moon's orbit in a relatively short time.
