A stone is thrown vertically upwards with a initial speed of 10 m/s from the edge of the roof of the house of Height H=20 m
a) how long does it takes for the stone to hit the ground
b) At what velocity it will hit the ground
Answers
Answered by
1
Answer: here is your answer please mark me as brainlest
Explanation: Answer
Correct option is
D
10 m
Let u be the initial velocity and h be the maximum height attained by the stone.
v
1
2
=u
2
−2gh,
(10)
2
=u
2
−2×10×
2
h
100=u
2
−10h ....(i)
Again at height h,
v
2
2
=u
2
−2gh
(0)
2
=u
2
−2×10×h
u
2
=20h ... (ii)
So, from Eqs. (i) and (ii) we have
100=10h
h=10m
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