therna8npon therna8npon
  • 20-10-2016
  • Physics
contestada

A heavy object is dropped from a vertical height of 8.0 m. What is its speed when it hits the ground?

Respuesta :

emmarobert
emmarobert emmarobert
  • 23-10-2016
What do you know:
d=-8.0mm (starts higher and ends lower so it is negative)
Vi=0m/s (because it was dropped, not thrown)
A=-9.8m/s^2 (gravity)
Vf=???
Use the equation:
Vf^2=Vi^2+2A(d)
Vf^2=2(-9.8)(-8.0)
Vf^2= 156.8 -->find the square root of this
Final answer: Vf= 12.5m/s
Answer Link

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