How to Measure ANY Cliffs Height with a Rock

[hellozafawgd]

Imagine accidentally dropping your phone while trying to press start time on the rock

[Hazard-]

Metric:
(Time x Time) x 5
Eg. (2.65 x 2.65) x 5 = 35 metres

[KristiStratton-gchw]

“I’m about to jump if this bridge”
Me: still not crazier than making a heist for squirrels.

[dallinstoddard]

Instructions unclear, I dropped my phone and pressed start on my rock

[ZackSmith-nket]

He forgot to account for the 0.24 second delay (which is the average human reaction time) which would put it at 92 feet deep. Since the drop is so short it’s hard to be accurate; the longer the drop time the more accurate this calculation becomes.

[notdelusionalcowboysfan]

Mark saying “I’m about to jump off this bridge” is surprisingly not the craziest thing he’s said

[Aymen_Lahdhiri]

Bro has the slowest reaction time ever 😭😭💀

[AngelaLRsurfinginstilettos]

Oh, you were so smooth here Mark...so cool, so calm.
😄👏🏼🌟🌟🌟🌟🌟

[fred]

This song was always playing in my preschool

[Tijme]

For the people who don’t understand how he calculated that:
s=0.5 • a • t^2
s is distance in feet (in this case)
a is acceleration in feet per second, the gravitational constant or 32 feet per second
t is time in seconds

That leaves us with s=16•t^2

[georgecoyle]

An simple physics taught me that it never gonna be that acurate

[etrnox]

H= ut+1/2at²
Simple kinematical equation yet so useful

[drakondra]

As European physics lover: WHY YOU USE FEETS IN CALCULATIONS

[兀]

"Here's how to measure any cliffs using a rock and you're phone"
I guess if you want, you can also use a human too 💀

[plague_doc]

The 7 mile hike up to that point is the best

[Ham_but_its_chicken]

This is so useful now i can know how deep the ocean is!

[just-k]

My dad thought me this when I was like 9, never forget that since

[MTC]

He is the best engineer of this generation !!

[amirhosseinhemmatyar]

We could use this method because we can ignore the force of air, because of that the acceleration of the rock is equal to the gravity being 9.8 that we say 10 for simpler calculationand then we have x=0.5at² for metric system

[ritikvatsa]

People seem confused, it is pretty simple.
S=ut+1/2gt^2. Here s is the distance covered and u i.e initial velocity is 0 so ut=0 and acceleration due to gravity g is 9.8 m/s^2 which will be converted in to ft/s^2. So if you convert 9.8 metres into feets you will get 32 approximately. Then you will divide it by two and multiply with the square of time taken as the equation has 1/2 gt^2. Hence you will get 16 multipled by square of time taken