A stone is dropped from a height of 10 m on an unknown planet having g=20m/s^2, Calculate the speed of the stone when it hits the surface of the planet.
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Answer :
The speed of the stone when it hits the surface of the planet is 20m/s.
Step-by-step Explanation :
Given : height (h) = 10m
Acceleration due to gravity (g) = 20m/s²
To find : The speed of the stone when it hits the surface of the planet = ?
We know that ,
v² = u² + 2gh
Where, v = final velocity of stone
u = initial velocity of stone = 0
g = acceleration due to gravity
h = height
Substituting the given value in above formula we get,
v² = 0 + 2 × 20 × 10
= 400
v² = 400
v = 20m/s
Hence The speed of the stone when it hits the surface of the planet is 20m/s.
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