djhughes12 djhughes12

03-09-2015
Physics

contestada

ball is dropped from rest at a height of 80m above ground. what is its speed just as it hits the ground.

Respuesta :

03-09-2015

Using SUVAT (S is displacement, U is initial Velocity, V is final velocity, A is acceleration, t is time);
S = 80m
U = 0ms^-1
V = ?
A = 9.8ms^-2
T = XXX
Use S U and A to find V;
V^2=U^2+2AS
V^2=0+2*80*9.8
V^2=1568
V=39.6ms^-1

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