121. Lava Bombs A volcano shoots out blobs of molten lava, called lava bombs, from its summit, as shown in
Figure 3.33. A geologist observing the eruption uses
a stopwatch to time the flight of a lava bomb that is
projected straight upward. If the time for it to rise to
its maximum height is 2.38 s and its acceleration is
9.81 m/s2 downward, what was its initial speed?
x

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

The answer is as follows in the photo