Does a bullet ever slow down?

A bullet will accelerate until it leaves the barrel, typically around Mach 3. It will then immediately start decelerating at slightly more than 10 metres per second per second - gravity and air resistance will slow it down.

theguardian.com - What happens to a bullet that is fired vertically into the air ... - The Guardian

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NOOKS AND CRANNIES

What happens to a bullet that is fired vertically into the air? Has anybody died as a result? Dave Corbett, Bilbao The Basque Country,Spain It keeps going until it runs out of kinetic energy then it starts to fall to earth. There have been many cases of injury from falling bullets, particularly in the Middle East where firing into the air is a common pastime. Jack Hill, St Albans In the Philippines, people are frequently killed by falling bullets, especially around election time when firing into the air is, for some reason, a popular pastime. James Barnes, Hong Kong, China It comes back down at almost the same speed at which it was fired - "almost" because on descent it accelerates to the point at which the surrounding air prevents any further acceleration. But the great height the bullet reaches means that if its trajectory is not perfectly vertical, it may come back down a great distance away. Peadar Mac Con Aonaigh, Brixton, London, UK A bullet will accelerate until it leaves the barrel, typically around Mach 3. It will then immediately start decelerating at slightly more than 10 metres per second per second - gravity and air resistance will slow it down. At some point high in the air (work it out yourself) the bullet will stop and begin falling. It would reach its terminal velocity of about 30 mph quite quickly and will fall back to earth. Being hit on the head or in the face by a bullet doing 30 mph would be unpleasant but is unlikely to be fatal unless you're very unlucky. Simon Blake, Shrewsbury, UK The reason it doesn't land at the same speed as it was fired is due to the different forces involved in each stage. There is initially a large explosive force which accelerates the bullet up to a very high speed very quickly. The bullet is then left to gradually decelerate due to the pull of gravity and friction with the air, until it stops. Then, gravity acts as an accelerating force but friction still acts as a decelerating force. When these forces balance, the bullet doesn't accelerate any more but stays at the same speed (the `terminal velocity'). So, a bullet fired from a plane would hit the ground at the same speed as a bullet fired from the ground such that it just reached the plane and then dropped, since friction acts to decelerate the bullet regardless of direction. Otherwise, seagulls would be amongst the most dangerous creatures on Earth. Mark Lewney, Cardiff It's a tradition in the Deep South to blast guns off into the air at New Year. It has resulted in death in the crowded New Orleans French Quarter. Alison Pringle, Baton Rouge, Louisiana The Pakistani custom of firing rifles during wedding celebrations has led to a number of tragedies. In the Peshawar region, jubilant cousins blasted away with rented AK-47 assault rifles, accidentally killing the groom's father and postponing the wedding for a 40-day period of mourning. In another incident, shots severed overhead power cables which electrocuted eight guests and set part of the village on fire. Guy, UK

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How much is John Wayne's gun?

– The Winchester 1892 SRC used by John Wayne in both True Grit and Rooster Cogburn was a highlight of Brian Lebel's January 23 Old West Auction when it sold for $88,500 to an American buyer.

antiquesandthearts.com - John Wayne's 'True Grit' Carbine Loads Up $88500 For Brian Lebel

MESA, ARIZ. – The Winchester 1892 SRC used by John Wayne in both True Grit and Rooster Cogburn was a highlight of Brian Lebel’s January 23 Old West Auction when it sold for $88,500 to an American buyer. The carbine featured the actor’s signature across the lever loop and came with a shortened barrel that allowed Wayne to exercise his theatrical move: the one-handed rifle flip reload on horseback. Along with a number of other pieces in the sale, the rifle had provenance to Stembridge Gun Rentals, a firm founded in Hollywood in 1920 to supply firearms to the movie industry. The firearm came with invoices from the Rooster Cogburn rental.

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