Please see the attachment!

Question

anonymous · Answer

attachment

anonymous · Answer

For the first one, take the derivative of the equation and find out the time when the velocity is .8 m/sec. This can be plugged into the height equation to get the height at that point. The second one will also use the velocity equation found by taking the derivative but 0 will be used instead.

anonymous · Answer

@Kevonni Hi, I got the right answer, just wanted to confirm that I was doing it corectly, thank you! 
If I wanted to calculate the max. velocity of the wave, how would that work?

anonymous · Answer

You take the derivative of the velocity, which gives acceleration. The same optomization method is used.

anonymous · Answer

Is that the correct way then @Kevonni?

anonymous · Answer

Yes!