Find distance fallen given time of fall

[Spenceriscool]

1.An object is dropped, and falls for 4.7 seconds before hitting the ground, how high is the object when it was dropped?2. D= 1/2a[t/f][v/i][t][/i]
D= 1/2a[t][/f]
[T][/f]= 2D/a

The Attempt at a Solution

D=1/29.8*4.7
D= 23 meters

 

[jedishrfu]

Welcome to PF!

Your post is terribly formatted. How do you expect anyone to answer?

Basically you start with d= 1/2 * g * t^2 and you know g=9.8 m/s/s and you have t=4.7 secs so just plug it in.

In your case, you need to use t^2 not t in your computation.

 

[andrevdh]

Is this maybe helpful? http://www.schoolphysics.co.uk/age16-19/glance/Mechanics/Equations_of_motion/index.html

 

[jedishrfu]

Nice reference Andre.