20emilyp 20emilyp

18-07-2017
Physics

contestada

If a small rock is dropped from a height of 3.1 m how fast will it be moving when it reaches the ground 0.80 seconds later

Respuesta :

amirreza688 amirreza688

18-07-2017

x=1/2 at^2
3.1=1/2 a *0.64
a=9.68
v=at
v=0.8*9.6875=7.75

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