An object is dropped from the top of the building. If it takes 10 seconds to hit the ground, what is the height of the building?
Correct answer: B. 490 m
- A. 390 m
- B. 490 m
- C. 590 m
- D. 690 m
- E. 790 m
Explanation
As the object is dropped so initial velocity is zero :vi =0 m/st =10 sh = ?h = vixt +½ gt2 h = 0x10 +½ (9.8)(10)2 (g=9.8m/s2)h = 490 mSo option B is correct.As this question is theoretical, options A, C , D and E are incorrect.
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