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Magnitude of the net force

  • Thread starter discosucks
  • Start date
  • #1
23
3

Homework Statement



An 850 kg car accelerates uniformly from rest to 33 m/s in a distance of 120 m. What is
the magnitude of the net force acting on the car?

Homework Equations



F = ma

dynamic equations

The Attempt at a Solution



So i think i have this one sorted but just posting to see iv got it right .

Seeing as i need acceleration to find the force i have to find it using the info i have so

a= ?
s= 120
v = 33
u = 0
t = not needed .

v^2=u^2+2as

(33)^2 = 0 + 2(a)120

1089 = 240a

4.5375 = a

4.5375 m/s^2

F = ma

850 x 4.5375

3856.875 N



 

Answers and Replies

  • #2
NascentOxygen
Staff Emeritus
Science Advisor
9,244
1,068
v^2=u^2+2as
Method looks right. (I haven't checked your arithmetic.)
 
  • #3
105
3
It seems right ,,.
 
  • #4
23
3
Great! thanks lads!! this site rocks!! need to find a similar one for chemistry and biology haha
 

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