Answer :

In the figure, let AC be the ladder and AB is the wall. BC is the distance of the foot of the ladder from wall AB. Join B and C. We get right-angled triangle ∆ABC. Given that, BC = 2m, ∠ACB = 60°. We use trigonometric ratio tan taking AB as the height and BC as the base.

In ∆ABC,

or,

where cos60° = 1/2.

So, the correct option is (D).

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