It's about 100 times as heavy as a Football (American)
In other words, 50 kilograms is 121.63435155030 times the weight of a Football (American), and the weight of a Football (American) is 0.008221361706249 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.396893323750 kilograms and 0.4252428468750 kilograms. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
It's about 150 times as heavy as a Can of Soup
In other words, the weight of a Can of Soup is 0.0071 times 50 kilograms.(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 0.350 kilograms. Cans have been used to store soup and other foods since their invention in 1913, but a dedicated can opener was not developed until cans began to use thinner materials — prior to that time, cans were usually opened using various blunt instruments and tools.
It's about 150 times as heavy as a Human Heart
It's about 300 times as heavy as a Hamster
In other words, the weight of a Hamster is 0.003 times 50 kilograms.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 0.20 kilograms. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 25 kg of food in their borrows.
It's about 300 times as heavy as a Billiard Ball
In other words, 50 kilograms is 306.730103909390 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.0032601951593751 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.15592237718750 kilograms and 0.170097138750 kilograms. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about 300 times as heavy as a Puck (Hockey)
In other words, 50 kilograms is 306.730103909390 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.0032601951593751 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 0.15592237718750 kilograms and 0.170097138750 kilograms. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about 350 times as heavy as a Baseball
In other words, 50 kilograms is 344.136214142250 times the weight of a Baseball, and the weight of a Baseball is 0.0029058261203125 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.1417476156250 kilograms and 0.148834996406250 kilograms. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).