A man 2 metres high walks at a uniform speed of 5 km/hr away from a lamp-post 6 metres high. Find the rate at which the length of his shadow increases.

A man of height 2 metres walks at a uniform speed of 5 km/h away from a lamp post which is 6 metres high. Find the rate at which the length of his shadow increases.

A man 2m tall walks at a uniform speed of 4m/min away from a lamp post 6m high. Find the rate at which the length of his shadow decreases.

A girl of height 90 cm is walking away from the base of a lamp post at a speed of 1.2 m/sec. If the lamp post is 3.6m above the ground, find the length of her shadow after 4 seconds.

A girl of height 90 cm is walking away from the base of a lamp-post at a speed of 1.2m"/"s . If the lamp is 3.6 m above the ground, find the length of her shadow after 4 seconds.

A man, 2m tall, walks at the rate of 1(2)/(3) m/s towards a street light which is 5(1)/(3) m above the ground. At what rate is the tip of his shadow moving and at what rate is the length of the shadow changing when he is 3(1)/(3)m from the base of the light ?

A girl of height 100 cm is walking away from the base of a lamp-post at a speed of 1.9m"/"s . If the lamp is 5m above the ground, find the length of her shadow after 4 seconds.

A ball is thrown downwards with a speed of 20 ms^(–1) from top of a building 150m high and simultaneously another ball is thrown vertically upwards with a speed of 30 ms^(–1) from the foot of the building. Find the time after which both the balls will meet - (g = 10 ms^(–2))

Two roads OA and OB intersect at an angle 60^(@) . A car driver approaches O from A, where OA = 800 metres, at a uniform speed of 20 m/sec. Simultaneasly, O runner starts running from O towards B at uniform speed of 5 m/sec. Find the time when the car and the runner are closest.

The water level on a tank is 5m high. There is a hole of 1 cm^(2) cross-section at the bottom of the tank. Find the initial rate with which water will leak through the hole. ( g= 10ms^(-2) )

A ladder, 5 meter long, standing on a horizontal floor, leans against a vertical wall. If the top of the ladder slides downwards at the rate of 10 cm/sec, then the rate at which the angle between the floor and the ladder is decreasing when lower end of ladder is 2 metres from the wall is ............