You are correct!
Happy to assist you!
Pulling a person down so we stick to the surface
No it is unsafe. Even if they are empty they cannot
His velocity is 3 m/s in the direction in which he is running in. which.
We make a graphic of this problem to define the angle.
The angle we can calculate through triangle relation, that is,

With this function we should only calculate the derivate in function of c

That is the rate of change of
.
b) At this point we need only make a substitution of 0 for c in the equation previously found.

Hence we have finally the rate of change when c=0.