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An object is dropped on Earth from a height of 15 m. What is the magnitude of the velocity of the object just as it hits the ground?
0 m/s
4.4 m/s
9.8 m/s
17 m/s

Respuesta :

Here, we know, according to 3rd Equation of Kinematics, 
v² - u² = 2as

Here, u = 0  [ Free fall ]
a = 9.8 m/s² [ constant value for the Earth system ]
s = 15 m

Substitute their values, 
v² - 0² = 2 * 9.8 * 15
v² = 294
v = √294
v = 17.15 m/s

In short, Your Answer would be Option D

Hope this helps!

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