Could someone please help me out ? grade 11 physics ?

  • Thread starter xxt
  • Start date
  • #1
xxt
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Member warned: Non-Descriptive Thread Title

Homework Statement


A 2 kg sponge is dropped from rest, pulled down by gravity. how fast will it be travelling in 6 seconds, with a 5 N force of air resistance acting on it ?

Homework Equations


vf= vi+ gt (im just guessing coz im not sure )

The Attempt at a Solution


the speed in 6 seconds ?? (im not sure what to write here)

so could someone please help me out pleaseeee???? thank you!!!!!!!!!
 

Answers and Replies

  • #3
ehild
Homework Helper
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Welcome to PF!

The wording of the problem is not clear, did you copied it correctly? Was it not "how fast will it be travelling in the 6th second" ?
Anyway, it is said that also air resistance acts on it, in addition to gravity. So what is the acceleration of the sponge? vf=vi+gt is valid when the only force is gravity.
 
  • #4
392
13
First, find the acceleration using the Second Newton Law
Then, use the formula vf= vi + at to get the final velocity (Note : Use negative sign for the opposite direction of the falling ball)
 

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