Which activities demonstrate reaction time the most?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Which sound characteristic is not affected by the relative motion of an object