Answer
toy begins to slide when the plane is at an angle of 36.0°
at this point the toy has just overcome the static friction


since toy begins to slide

now on comparing




as the body is moving at constant velocity acceleration will be zero
so now,



Because Any object or substance that is less dense than a fluid will float in that fluid, so hot water rises (floats) in colder water. When fluids are cooled, they contract and therefore become more dense. Any object or substance that is more dense than a fluid will sink in that fluid, so cold water sinks in warmer water
Blood is an incompressible fluid. Hope this helps!
The question is incomplete. If D=1/T then the answer is D, but if instead of =, there is a proportional sign, then the answer is C.
I might have did mistake with calculations but this is how you should do.