Basic motion stuffs, time and velociton

  • Thread starter k3l
  • Start date
  • #1
k3l
12
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Basic motion stuffs, time and velociton :(

hi
oh my gosh... i can't believe i forgotten how to do this...
i have to work out the time when will the two particles meet... where one particle (A) is travelling at a velocity of 80km/h, and (B) is travelling with a velocity of 100km/h while (B) is 350km behind (A)
(assume they are travelling toward the same directions)

thx
 

Answers and Replies

  • #2
6
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[tex] s_a = s_b [/tex]
[tex] s_a = s_0 + v_a * t [/tex]
[tex] s_b = v_b * t [/tex]

Insert both in first equation and calculate t.
 
  • #3
500
0
Basic algebra.

Distance=rate x time

D1=x
D2=x+350
so for the equation distance = rate x time just plug in x and x+350 as your distance, use t for time
since x is the same value, you can combine the two and solve for t.
 
  • #4
DB
501
0
I'm a bit confused, do you add the 2 distances?
[tex]x+x+350=100 \\ or \\ 80? *t?[/tex]
Maybe I'm stupid but I'm confused...
 
  • #5
698
0
use relative time frames. Take the moving particles frame that is behind the other particle, subtract the other cars speed and no consider that the other particle is stationary.

[tex] V_{slower\ particle} = 80km/h [/tex]
[tex] V_{faster\ particle} = 100km/h [/tex]
[tex] V_{faster\ particle\ relative\ to\ slower\ one} = 100km/h - 80km/h = 20km/h [/tex]

now your system becomes linear.

use:

[tex] d = Vt [/tex]

you should know what to sub in where.

Regards,

Nenad
 

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