Early u. s. rocket technology was based in part on information taken from german v-2 rockets.
true
false

True

Explanation:

Although the rocket science and use of rockets in warfare goes back centuries, a great shift in the progress of rocket science occurred after the end of World War 2. During the World War 2, a lot of improvement was done in the rockets but it was mainly for the military purpose.

German scientist Wernher von Braun played a crucial role in development of V2, the first rocket capable of entering into SPACE if launched vertically. After the end of World War 2, US captured von Braun and other German rocket scientists and brought them to US and started Operation Paperclip. The technology of V2 rockets was used to develop the early USA rocket: Redstone rocket.

the answer is b, have negligible mass

this could be newton#'s law of cooling. the cooling curve is exponential