Kinematics Question 235

Question: A body falling from a high Minaret travels 40 meters in the last 2 seconds of it’s fall to ground. Height of Minaret in meters it’s (take g=10m/s2 ) [MP PMT 2002]

Options:

A) 60

B) 45

C) 80

D) 50

Show Answer

Answer:

Correct Answer: B

Solution:

Let height of minaret it’s H and body take time T to fall from top to bottom.

H=12gT2 -(i)

In last 2 sec. body travels distance of 40meter so in (T2) sec distance travelled =(H40) m . (H40)=12g(T2)2 -(ii)

By solving (i) and (ii) T=3 sec and H=45 m .



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