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A penny falls from a windowsill 25.0 m above the sidewalk. How fast is the penny moving when it strikes the ground? (Remember that the velocity will be negative due to the downward motion of the penny)

Respuesta :

To determine, the final velocity we use one kinematic equation. It would be 2ax = vf^2 - v0^2. The initial velocity would be zero since it starts from rest. Therefore, the equation would be:

vf = √(2ax)        where a is the acceleration ( a = g ) and x is the height

vf = √(2)(9.8)(25)
vf = - 22.14 m/s
rickymenge00

Answer:

22.14ms

Explanat2ion:

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