plz guys answer this question.........
Answers
Hey there!
The object is falling under gravity. As it is moving towards the earth, Its acceleration is +g.
As it is dropped, It has initial velocity = 0 .
The stone passes the window of 3m high in 1s .
Let the distance between the roof and that window be " k " k
m and the time taken to reach that " k "m is t
That is k = 1/2gt² ( From the second equation of motion)
Given that, Stone passes through the window in 0.1 second.
So it travels k+3m in t + 1seconds .
k + 3 = 1/2g(t+ 1)²
Substituting the value of k,
1/2gt² + 3 = 1/2g(t²+1 + 2t)
1/2gt² - 1/2gt² + 3= 5 g + 1gt
2 = 5 * 10 + 1(10)t
2= 5 + t
2 - 5 = t
-3 = t.
Therefore, The stone takes 3 seconds to travel from roof to top of the window.
Now, We have to find The distance between roof and top of the window ( k)
k = 1/2(10)(t²)
k = 5t²
k = 5(3)²
k = 45
answer is 45