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)

Question

Kianna Miles

Physics

13 January, 05:16

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)

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Tess Ochoa · Answer 1

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