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Hi, I need some help with a homework problem invovling acceleration

  • Thread starter mindgame
  • Start date
6
0
1. Homework Statement
What is the acceleration of your car?

Time Velocity[ms]
1 8.8
2 12.82
3 16.25
4 20.46
5 24.22
6 28.09
7 31.77
8 35.24
9 39.32
10 42.37
11 44.61
12 46.63
13 49.01
14 50.53
15 52.1
16 52.32
17 53.6
18 53.44
19 53.74
20 53.25

http://img87.imageshack.us/img87/8674/velocitygraphob6.jpg [Broken]


2. Homework Equations



3. The Attempt at a Solution
 
Last edited by a moderator:
6
0
I really just don't know where to start, is there an equation I need to use or is this much more complicated?
 

Kurdt

Staff Emeritus
Science Advisor
Gold Member
4,769
6
The definition of acceleration is the rate of change of velocity with time. What you need to do is find out how much the speed changed and in what time, then:

[tex] a= \frac{\Delta v}{t}[/tex]
 
6
0
(53.25 - 8.8) = 44.45

a = (44.45) / 20s

a = 2.2225 m/s

Is this right?
 

radou

Homework Helper
3,105
6
What's with the function in the upper right edge v(t) = 3.6688 t + 5.6189 ?
 
6
0
That's just the slope of the trendline for the increasing part of the graph. He told us in class we had to show it.
 

cristo

Staff Emeritus
Science Advisor
8,056
72
Ok, so from above [tex] a= \frac{\Delta v}{t}[/tex] , or to put it another way, a is the gradient of the graph of v against t. Given your trendline, in the form y=mx+c, how can you read off the gradient?
 

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