Answer:
Explanation:
Generally from kinematics equations we have that
Here u is the initial velocity of the rock and the value is 0 m/s given that there was no information that it was in motion before the fall
substituting 1.43 s for t and 
for g we have that
=>
The negative sign show that the displacement is in the direction of the negative y-axis
Answer:
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Try B if it is not it I am sorry I checked on Google
<h2>precipitation reactions</h2>
α prєcípítαtíσn rєαctíσn rєfєrs tσ thє fσrmαtíσn σf αn ínsσluвlє sαlt whєn twσ sσlutíσns cσntαíníng sσluвlє sαlts αrє cσmвínєd. thє ínsσluвlє sαlt thαt fαlls σut σf sσlutíσn ís knσwn αs thє prєcípítαtє, hєncє thє rєαctíσn's nαmє. prєcípítαtíσn rєαctíσns cαn hєlp dєtєrmínє thє prєsєncє σf vαríσus íσns ín sσlutíσn.
