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While training for a triathlon, Trina will first swim, then cycle and finally run. She will swim either 200, 300, 400 or 500
1. 2 answers
2. 463 views
Two soccer players on a breakaway start from midfield and run straight down the field with a separation of d=5 m and with the
1. 2 answers
2. 468 views
You and a friend are going to a river, where they have a rope swing. Your friend, who has a mass of 60 kg, hops on the end of
1. 3 answers
2. 588 views
terrorists are trying to take over the world. They know the password to the weapon is 5 digits long and contains either 0 or 1,
1. 1 answer
2. 418 views
Collision of charged particles}} A proton moves in vacuum and enters a region where there's another proton at rest. The protons
1. 2 answers
2. 387 views
How many ordered pairs of integers (a,b) are there such that 1/a+1/b=1/200?
1. 2 answers
2. 509 views

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