I couldn\'t solve these problems, could u at least tell me what formula should I

Question

I couldn't solve these problems, could u at least tell me what formula should I use 4 each

These r the ones we're using in class
V=x/t. °°°°°°°° a=v/t. °°°°°°°° Vf=at +vi °°°°°°°° x= 1/2a(t)^2 +vit °°°°°°°°° v^2=vi^2+2ax


a rock is thrown horizontly from a bridge with a velocity of 5m/s. it hits the water below in 2.2 seconds.

A) How far does the rock travel horizontally before hitting the water

B) how high is the bridge?

C) what is the horizontal speed of the rock just before it hits the water?

D) what is the verticale speed of the rock just before it hits the water?


Appreciated :)

Explanation / Answer

a) 5x2.2 = 10.4 m

b) d=.5x9.8x2.2^2 = 23.716m

c) 5m/s

d) vf= at vf=-9.8X2.2 = -21.56m/s -------> 21.56 m/s    <--------- because it is speed

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