A man falls from a cliff. When he has fallen for 3.5sec he hears the echo of his shout from the valley floor below. The speed of sound is 340 m/s. How tall is the cliff? If the air resistance is neglected, how fast will he be traveling in the instant before he hits the ground?

Question

kc_kennylau · Answer

g=9.81, $s=ut+\frac12at^2$, t=3.5, a=g, u=0, find s first

tkhunny · Answer

There's the rest of the question.

So, the shout must travel: Cliff Height + Remainder of the Fall.