Explanation:
Let consider positive when top of the ladders slides up and the bottom of the ladder slides away from the wall. Ladder can be described by Pythagorean Theorem:
Where:
is the ladder length,
is the horizontal distance between the bottom of the ladder and wall and
is the vertical distance between floor and the top of the ladder.
An expression describing velocities at top and bottom of the ladder can be obtained by using derivatives as a function of time:
The rate for the top of the ladder is:
1 , 2 and , 4 on usa test prep
Explanation: