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OpenStudy (anonymous):
how long will a 25 kg block to fall to the ground 78.4 m below
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OpenStudy (anonymous):
v=d/t
OpenStudy (anonymous):
f=ma so 25kg (9.8m/s/s)=245N then use the another formula that works force and distance and velocity together.
OpenStudy (anonymous):
d=1/2 * a * t2 (t square) so 78.4=1/2*g*t2 78.4=1/2*9.8*t2 t2=16 t=4 sec
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