Vanguard Vanguard
  • 25-08-2015
  • Physics
contestada

A ball dropped from a bridge takes 3.0 seconds to reach the water below. How far is the bridge from the water?

Respuesta :

olemakpadu
olemakpadu olemakpadu
  • 25-08-2015
Since it is dropped, initial velocity u = 0

Using s = ut + (1/2)gt^2,        putting u = 0,  g = 10 m/s^2

s =(1/2)gt^2,                  t = 3s

s = 0.5 * 10 * 3 *3

s = 45 m.

The bridge is 45m above the water.
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