A train was moving at 50m/s and slow down to 20 m/s in 50 seconds, what was its acceleration?

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?