physics

In Mostar, Bosnia, the ultimate test of a young man's courage once was to jump off a 400 year old bridge into the River Neretva, 23 m below the bridge. (a) How long did the jump last? (b) How fast was the diver traveling upon impact with the river? (c)if the speed of sound in air is 340 m/s, how long after the diver took off did a spectator on the bridge hear the splash?

Work: I am not sure if I am doing this correctly.

(a) (v2)^2=(0)^2+2(9.8 m/s^2)(23m)
v2 = 21.2m/s
9.8m/s^2=(21.2m/s)/t
t=2.16s
(b) I don't know
(c) (340m/s)(2.16s)=157m

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  1. (b)-->(a)21.2m/s
    (c)(23m)(s/340m)=0.0068s
    plus 2.16 from (a)

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