What is the KE of a 13kg boulder moving at 78.3m/s?

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

The slope of a velocity time graph over any interval of time gives the during that interval

The ozone hole appears in antarctica during