Question

Answer the following in brief. (3 marks each)
[06]
Q. 11 A5 m long ladder is placed leaning towards a vertical wall such that it reaches the wall
at point 4 m high. If the foot of the ladder is moved 1.6 towards the wall, then find the
distance by which the top of the ladder would slide upwards on the wall.​

Answer 1

Step-by-step explanation:

Energy resources exist in different forms - some exist as stocks and are exhaustible, others exist as flows and are inexhaustible. The effects of climate change, and the impact that greenhouse gas emissions have on the atmosphere, are ushering in a reassessment of where our energy supply comes from and, more importantly, how sustainable it is.

Answer 2

Question :

➙ 5 m long ladder is placed leaning towards a vertical wall such that it reaches the wall

at point 4 m high. If the foot of the ladder is moved 1.6 towards the wall, then find the

distance by which the top of the ladder would slide upwards on the wall.

Answer :

➙ In figure ∆DLW and ∆ERW is a wall DL and RE are two positions of ladder of length 5m .

[ refer the attachment ]

In right angled ∆LWD ,

᠉ DW² + LW² = DL² [ By Pythagoras ]

᠉ DW² = DL² - LW²

᠉ DW² = 5² - 4²

᠉ 25 - 16 = 9

᠉ DW = 9

NOW ,

RW = DW - DR

᠉ 3 - 1.6 = 1.4 m

In right angled ∆RWE ,

᠉ EW² + RW² = RE² [ By Pythagoras ]

᠉ EW² = RE² - RW²

᠉ 5² - 1.4² = 25 - 1.96

᠉ 23.04

᠉ EW = √23.04 = 4.8m

Therefore ,

The distance by the ladder shifted upward =

᠉ EL = EW - LW = 4.8m - 4m = 0.8m

__________________________________