Question

please explain your answer i will mark it as brainliest answer​

Answer 1

Answer:

Explanation:

First calculate initial height of stone

$s=ut+\frac{at^2}{2}$

$-s=0(5)-\frac{10*5^2}{2}\\-s= -5*25\\ s=125m$

Distance covered in 3 sec from top

$-s=-\frac{10*3^2}{2}\\-s=-{5*9}\\s=45 m$

Distance left= 125-45= 75m

Now time required to cover 75 m

$-s=-\frac{gt^2}{2}\\-75=-5t^2\\t^2=15\\t=\sqrt{15}seconds$

Total= ≈4 seconds