A ladder 5m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2cm/s. How fast is its height on the decreasing when the foot of the ladder is 4m away from the wall.

A laader 10 m long rests against a vertical wall with the lower end on the horizontal ground. The lower end of the ladder is pulled along the ground away from the wall at the rate 3 cm//s. The height of the upper end while it is descending at the rate of 4 cm/s, is : a) 4 sqrt3 m b) 5 sqrt3 m c) 5 sqrt2 m d) 6 m

A man 160 cm tall, walks away from a source of light situated at the top of a pole 6 m high, at the rate of 1.1 m/sec. How fast is the length of his shadow increasing when he is 1 m away from the pole?

A ladder leans against a wall, with its foot 2 metres away from the wall and the angle with the floor is 40^circ . How high is the top end of the ladder from the ground?

A 2.6 metre long rod leans against a wall,its foot 1 metre from the wall.When the foot is moved a little away from the , wall, its upper end slides the same length down.How much farther is the foot moved? .

Sand is pouring from a pipe at the rate of 12 cm^3 / s. The falling sand forms a cone on the ground in such a way that the height of the cone is always one-sixth of the radius of the base. How fast if the height of the sand cone increasing when the height is 4 cm ?'

A stone falls down from the top of a wall in 1 s to the ground ( g=10 m/s^2 ) How much is the height of the wall?