Posted by **Nikki** on Thursday, March 1, 2012 at 9:21pm.

a 20 foot ladder leaning up against a vertical wall begins to slip. the base of the ladder makes an acute angle with the floor. when the angle equals 60 degrees the angle is decreasing at 0.1 radians/second. find the rate at which the height of th upper end of the ladder is changing when the angle equals 60 dregrees

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