An object is falling from a height of 7.5 meters. At what height will its velocity be 7 meters/second?
A. 49 meters
B. 7.5 meters
C. 7.0 meters
D. 5.0 meters
E. 2.5 meters
Answers
Answered by
5
Step-by-step explanation:
answer (D) of this question
Answered by
7
The correct answer is the option D) 5 m i.e the mass will be at a height 5 m from the ground.
The height (h) from which the body is falling is given as 7.5 m.
We have to find the height where the velocity will be 7 m/s.
Using the equation of motion-
v² = u² + 2as
v = 7 m/s , u = 0 , a = 9.8 m/s² , s = the distance from the top
=> 49 = 19.6 × s
=> s = 2.5 m
The height of the body at that moment = h - s = 5 m.
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