How Do Acceleration-Time Graphs Explain Motion?

[Spruance]

A 2,0 kg body moves along a straight line.

x={0,2,4,6,8,10,12,14,16,18,20} s
f(x)={10,10,20,30,50,50,50,20,10,5,0} m/s


a)
Make a acceleration-time graph

c)
Calculate the average force working on this body

 

[Spruance]

I tried to make a acceleration graph. However, something is wrong with it.

c) First I tried to find the average acceleration,

a = ((v - v0)/(t-t1)) = (0 m/s - 10 m/s)/(20-0)) = -0,5 m/s^2

then

E = ma

= 2 kg * -0,5 m/s^2

= - 1 N


Can anyone correct me?

 

[Hootenanny]

From the data given, both your graphs and calculations are correct. Why do you believe it be wrong?

~H

 

[Spruance]

Ok. It is - 1 N, and not 1 N?

 

[Hootenanny]

Ok. It is - 1 N, and not 1 N?

Yes, it is -1N from the given data.

~H