The kinetic energy k of an object in joules is given by the formula k = } mv?, where m is the object's mass in kilograms and v is its velocity in meters per second. An object's velocity is 20 meters per second and its kinetic energy is 48,000 joules. If it speeds up
to 30 meters per second, then what is its new kinetic energy?

On a certain portion of an experiment, a statistical test result yielded a p-value of 0.21. what can you conclude? 2(0.21) = 0.42 < 0.5; the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 21% of the time, so the test is not statistically significant. 0.21 > 0.05; the test is statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 79% of the time, so the test is not statistically significant. p = 1 - 0.21 = 0.79 > 0.05; the test is statistically significant.