1-D Kinematics - Free Fall: Stone Dropped Into a Well (includes time for sound to reach top of well)

[@arpitaroy5025]

This video should be at the top... What a teaching 🙏❤

[@joemock1559]

Thanks. This video easily explains how to get an answer. Out of all the videos I watched yours helped the most.

[@scottsecrest2190]

I am glad that it helped.

[@oneK3]

You have my deepest gratitude, this saved my homework grade!

[@daltonmoree]

Thank you. That was perfectly explained.

[@scottsecrest2190]

Thanks! Glad it helped.

[@SineadS]

thank you!!! I had no idea where to start with this problem and you totally made it make sense.

[@jamesking8602]

Awesome! This just helped me work through a problem I was stuck on.

[@scottsecrest2190]

Glad it helped!

[@acidcitrus5143]

Why is acceleration negative 9.8 when the rock is falling down?

[@scottsecrest2190]

Crest Fallen The acceleration of something in free fall is always downward. Since I made up the positive y-direction, the acceleration is negative. Because it is moving down (velocity is in the negative direction too) the object is speeding up. A common misconception is that negative acceleration always means slowing down, but that is not true.

[@acidcitrus5143]

thank you so much!

[@Walkingdeadman104]

Not all heroes wear capes

[@shashankkondapi4200]

THE GREATEST IN THE SIMPLEST WAY THANKS A LOT

[@update_5539]

I was able to skip a quiz cause I did a bonus question that was something like that.. Thanks!

[@VisuallyWarped]

Holy shit thank you so much you saved me

[@karljerichotonel8435]

Where did 340 come from? can u explain elaborately?

[@scottsecrest2190]

That was given in the problem - but that is the approximate speed of sound in air at sea level at room temperature. See this link for more explanation: www.physicsclassroom.com/class/sound/Lesson-2/The-Speed-of-Sound or this: www.engineeringtoolbox.com/air-speed-sound-d_603.html or this: hyperphysics.phy-astr.gsu.edu/hbase/Sound/souspe.html or this: en.wikipedia.org/wiki/Speed_of_sound

[@anshuanshu1911]

From which country u belonging to Plzz

[@scottsecrest2190]

United States

[@khalidhashimeh]

thank you

[@simrennagra1909]

if you plugged your final time into the other equation, it wouldn't be the exact same answer

[@scottsecrest2190]

It is close (51.694). The only reason it is not exactly the same is because that value for the time is rounded to 5 decimal places, not an exact value. If I kept even more digits, the two equations for the height would give even closer answers.

[@sirajnayak2443]

A stone is dropped into a well it's scrash is heard after 3s. another stone is thrown vertically and it's scrash is heard after 5s. Determine the initial speed of the second stone, if the velocity of a sound is 330 meter per second plzz solve this question

[@scottsecrest2190]

Use the information for the dropped stone to find the depth of the well, just like in this problem. Then, the time for the sound of the splash to reach the top for the second stone is the same as for the first stone, so you know the starting height and the time to reach the bottom of the well (5 seconds minus the time for the sound to reach your ears) and you can use the equation for height as a function of time to solve for the initial velocity, which will be the only unknown.

[@pavansuri.k8090]

thk u ..

[@princesspat5239]

THANK YOU

[@raghavgrover786]

a coin is dropped into deep well and is heard to hit the water 3.41 second after being dropped determine the depth of the world??? Upload kro

[@y_p7]

Thank you so much mate! You saved my ass!!!!

[@aaradhanah5059]

Thank you so mush it is much informative to solve real life problems

[@hussamalshammari4705]

shouldn't the time be t-3,4 ?

[@scottsecrest2190]

I defined the time to the bottom as t, and the time for the sound to come back up was (3.4 sec) - t. It is the total time minus the time to go down. When I solve for t, that is the time being asked for.

[@hussamalshammari4705]

+Scott Secrest uh i got u, u could also calculate the total time like this Δ Timetot =Δ tdrop +Δ tsound

[@Uzairtak]

thanks...it helped

[@madienaasisullah1184]

thank you so much omg