Thread: Stuck ? help

The acceleration in ms-2 ofa body starting from restis given by

f(t)= 1/10te^0.1t
Determine the velocity of the body after 20 seconds
Do not know where to start

Remember:



Then:



So we have:



We also know that since the body starts from rest.

Then:



This can be done by parts if you want. You get:

.

Plug in your initial condition:

.

Then,

.

Then,

.

If you want the velocity at t = 20, you have:

thanks for your help,I am slowly getting to grips with it.