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There is a 250-m-high bluff at Half Dome in Yosemite National Park in California. Suppose a...

There is a 250-m-high bluff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks apart from the top of this bluff.

Part (a) How fast will it be going when it strikes the ground in m/s?

Part (b) Assuming a reaction time of 0.22 s, how long will a tourist at the bottom have to get out of the way after hearing the sound of the rock breaking loose (neglecting the height of the tourist, which would become negligible anyway if hit)? The speed of sound is 340 m/s on this day.

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