Question

A 5 m ladder is bent on a wall
Its base is pulled at 2m/s. Find rate of change of height at base=4m

Answer 1

Use Pythagoras

Answer 2

\[T^2 + h^2 = 25 \]
\[2T*\frac{dT}{dt} = - 2h*\frac{dh}{dt}\]Now just put the Values