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A street-light is hung 20 ft. above the ...

A street-light is hung 20 ft. above the ground .An object falls freely under the gravity, starting from rest at the same height as the lamp and at a horizontal distance of 5 ft. from it . When the object has fallen through 16 ft, the speed of the shadow of the object on the ground is

A

`12 ft.//sec`.

B

` 11 ft. //sec`

C

`10 ft. //sec`.

D

`12 .5 ft.//sec`.

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The correct Answer is:
D
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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