A nearby supernova could have all of the following effects EXCEPT Select one: A. Radioactive supernova ejecta causes radiation sickness. B. Gamma-radiation makes cancer rates rise. C. Significant depletion of the ozone layer. D. A massive electromagnetic pulse fries electronics on the surface. E. Cosmic ray particles cause satellites to malfunction.

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s