The document describes a problem solving task to calculate the maximum length of a metal bar that can be moved from the ground floor to the fourth floor using a school lift. It provides the dimensions of the lift and uses the Pythagorean theorem to determine that the maximum length is 2.624 meters based on the height of the lift and clearance within it.

1. Group Work: Problem Solving Task
You are asked to move a metal bar from the ground floor to the fourth floor by using
the lift located at Block B in our school.
Calculate the maximum length of the metal bar so that it can be put into the lift.

2. Solution:
With the notation in the figure,
2 2 2
∵ IG +GB =IB (Pyth. Theorem)
2 2 2
∴ IB = [(1.23-0.2) +0.97 ] m
2
IB =2.0018 m
IB =√2.0018 m
IB =1.415 m (cor. to 4 sign. fig.)
2 2 2
∵ AI =IB +AB (Pyth. Theorem)
2 2 2
∴ AI =(1.415 +2.21 ) m
2
AI =6.886325 m

3. AI =√6.886325 m
AI =2.624 m (cor. to 4 sign. fig.)
∴ the maximum length of the metal bar so that it can be put into the lift = 2.624
m