A. 0.75sq.cm/sec
B. 30sq.cm/sec
C. 30πsq.cm/sec
D. 0.4πsq.cm/sec
f(x) = |x| has
A man 6 feet height walks at a uniform of 20 above the floor. An object falls freely under gravity, starting from rest at the same height as the lamp, put at a horizontal distance of 5 ft from it. The speed of the shadow of the object on the floor when it has fallen through 15 ft is
A ladder 20 feet long whose top is resting against a vertical wall on a level plane beginning to slide outward. When the foot and top of the ladder are sliding at the same rate, the distance of the foot from the wall is
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The least value of (x-a) (x-b) occurs at x=