Iwill give 50 points to anyone who can tell me what the hottest temperature ceiling is, and then tell me when that ceiling was lifted, and what was hotter than it and is now baffling scientist

The ceiling for global warming is 2 degrees Celcius, or about 3.6 Fahrenheit, which is basically a "safe" temperature change. The hottest temperature ever on Earth was in Libya, at 58 Celcius, about 134 Fahrenheit. Recently, west India experienced 51C, about 123F.
Temperatures are lifted by green house gases made by humans and an El Ninothat released heat from the Pacific Ocean.
This information is from a news article you may want to read:
nypost.com/2017/01/18/world-temperatures-hit-another-record-high-in-2016
There is also a global warming slowdown baffling scientists:
www.thegwpf.com/global-warming-slowdown-baffling-scientists-globe
I'm not sure if this answers everything, if you have more questions I would help. Hope this helps you out!

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.

B? i think so but hope that's right and answers your question