Escape Velocity Dad enquiry
Could you easily escape Earth’s gravity even at 1 mph ?
I think the original question was prompted by watching Nasa launches where at some point the announcer would say: “The rocket has now achieved escape velocity of …” Several answers are posted here, kindly pointed to me by @hookean. And a definition via Google:
On the surface of the Earth, the escape velocity (EV) is about 11.2 km/s, which is approximately 33 times the speed of sound (Mach 33) and several times the muzzle velocity of a rifle bullet (up to 1.7 km/s). However, at 9,000 km altitude in “space”, it is slightly less than 7.1 km/s.
Some comments re: space.stackexchange.com
The top answer echoes this definition : “The force of gravity decreases with distance. It follows an inverse-square relationship… ” and “EV is the initial velocity you need to throw a stone at so it could leave the earth”. When I clicked the more Escape Velocity button I got the following interesting graph
Overall I feel the one or two snippets discovered above may make SUVAT equation manipulation, in secondary school a tad more exciting