Posted by **Isis** on Friday, June 14, 2013 at 9:14am.

An object is dropped from a platform 100 feet high. Ignoring wind resistance, what will its speed be when it reaches the ground?

_____ ft/s

Please help me!!!

- Physics -
**Chan**, Friday, June 14, 2013 at 9:36am
solution

height(h)= 100ft

since the object starts at rest,

initial speed(U)=0

Final speed (v)= ?

since the object is falling under the influence of gravity and downwards

a=g= 32.17 ft/s^2

so

we have

v2=u2+2gh

v2= 0+ 2*32.17*100

v2= 6434

v=80.21f/s

the final speed was 80.21 f/s

- Physics -
**Anonymous**, Sunday, September 14, 2014 at 11:12pm
An object is dropped from a platform 100 feet high.ignoring wind resistance,how long will it take to reach the ground ?

- Physics -
**Rachel**, Friday, October 10, 2014 at 2:12pm
d=1/2gt^2

acceleration due to gravity= 32 ft/s^2

100= 1/2(32)t^2

100=16t^2

100/16 = 6.25

t^2= 6.25

t= 2.5

- Physics -
**kelsy**, Thursday, April 23, 2015 at 2:49pm
Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance light travels in one year.

State the speed in mi/s, using scientific notation. (1 mile = 5280 feet exactly, by definition; i.e., this is not a measurement.)

- Physics -
**emanuel**, Friday, April 8, 2016 at 7:41am
An object is thrown directly up (positive direction) with a velocity (vo) of 20.0 m/s and do= 0. How high does it rise (v = 0 cm/s at top of rise). Remember, acceleration is -9.80 m/s2.

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