Home
Class 10
MATHS
A boy of height 90 cm is walking away fr...

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

Text Solution

Verified by Experts

The correct Answer is:
1.6 m
Promotional Banner

Topper's Solved these Questions

  • GEOMETRY

    NCERT TAMIL|Exercise EXERCISE 4.1|8 Videos

  • GEOMETRY

    NCERT TAMIL|Exercise EXERCISE 4.2|8 Videos

  • COORDINATE GEOMETRY

    NCERT TAMIL|Exercise TRY THIS|15 Videos

  • MENSURATION

    NCERT TAMIL|Exercise Unit Exercise - 7|10 Videos

Similar Questions

Explore conceptually related problems

A girl of height 120cm is walking away from the base of a lamp post at a speed of 0.6 m/sec. . If the lamp is 3.6 m above the ground level, then find the length of her shadow after 4 seconds.

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

A girl of height 150cm stands in front of a lamp-post and casts a shadow of length 150sqrt(3)cm on the ground. Find the angle of elevation of the top of the lamp-post.

A ladder is placed against a wall such that its foot is at a distance of 2.5 m from the wall and its top reaches a window 6 m above the ground. Find the length of the ladder.

A lamp of negligible height is placed on the ground l_1 away from a wall. A man l_2m tall is walking at a speed of (l_1)/(10)m//s from the lamp to the nearest point on the wall. When he is midway between the lamp and the wall, the rate of change in the length of this shadow on the wall is -(5l_2)/2m//s (b) -(2l_2)/5m//s -(l_2)/2m//s (d) -(l_2)/5m//s

A lamp of negligible height is placed on the ground l_1 away from a wall. A man l_2m tall is walking at a speed of (l_1)/(10)m//s from the lamp to the nearest point on the wall. When he is midway between the lamp and the wall, the rate of change in the length of this shadow on the wall is -(5l_2)/2m//s (b) -(2l_2)/5m//s -(l_2)/2m//s (d) -(l_2)/5m//s

A girl looks the reflection of the top of the lamp post on the mirror which is 6.6 m away from the foot of the lamppost. The girl whose height is 1.25 m is standing 2.5 m away from the mirror. Assuming the mirror is placed on the ground facing the sky and the girl, mirror and the lamppost are in a same line, find the height of the lamp post ?

An observer of height 1.8 m is 13.2 m away from a palm tree. The angle of elevation of the top of the tree from his eyes is 45^(@) What is the height of the palm tree?

A boy of height 1m 45 cm is standing in front of long mirror at a distance 2 m . From this information, fill up the following sentences:b)The height of the image is-----