Using pythagoras theorem Case (i) Height of wall =√(7.6)2−(6.4)2 =√(1.2)×14 =√16.8 ≈4.1 m When the ladder slips 1.2 m, its top edge would beat a height of 4.1 – 1.2 m ≈2.9 m
∴BF=√(7.6)2−(2.9)2≈7 ∴Ladder shifts approximately 7 – 6.4 = 0.6 m