, , A rod of length ∠ leans against a smooth vertical wall while its other end is on a smooth flo...

, , A rod of length ∠ leans against a smooth vertical wall while its other end is on a smooth floor. The end that leans against the wall moves uniformly vertically downward. Select the correct alternative
(1) The speed of lower end increases at a constant rate
(2) The speed of the lower end decreases but never becomes zero
(3) The speed of the lower end gets smaller and smaller and vanishes when the upper end touches the ground
(4) The speed of the lower end remain constant till upper end touches the ground,

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