00:01
Okay, here we are told v and a for a particle.
00:04
We use the speed.
00:06
That's the function for that.
00:07
If i differentiate this, i get acceleration, and that's given to you, that's the value there.
00:14
I want to work out where v is increasing.
00:20
Well, to be increasing, it means acceleration has to be plus.
00:25
So it's decreasing, it's a minus acceleration.
00:29
So for increasing speed or we need a bigger than zero.
00:49
So let's figure out then where this item here is bigger than zero.
00:56
So we have 6t over 5, sine t squared over 5, bigger than 0, and the interval is 0 to 5...