Finding Velocity at a Given Time on an Acceleration v Time Graph

[ch2kb0x]

Homework Statement

The problem is, to find velocity at a given time (t=5 sec) on a acceleration v time graph.

Homework Equations

The Attempt at a Solution

I think the area under the curve represents the average velocity, but I really do not know how to find the velocity at THAT given time.

*Note: I included a picture on the bottom, I tried to find the area under the curve but did not come up with the correct answer. It is the graph labled Particle C

 

[Rake-MC]

area under the curve is the velocity.

 

[met4t]

You either

1. Integrate acceleration up to t=5 if acceleration is given as a function of t OR

2. Find the area under the curve within t=0 and t=5 inclusive

 

[ch2kb0x]

attachment is included.

 

[Rake-MC]

85 ms^-1 is incorrect?