A rock at rest fall off a tall cliff and it hits the valley below after 5 seconds? What is the rock's velocity? Remember g=9.8m/s2. DO NOT round numbers.
Include units in your answer otherwise it will be marked wrong.
Whoever answers this question will be the brainliest!!!

well in order to answer this question you have to provide more information < 3

2b2t

explanation:

2b2t

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol