jennaobenauer jennaobenauer
  • 23-10-2016
  • Physics
contestada

A car moving at 50 km/h skids 15 m with locked brakes. How far will the car skid with locked brakes at 150 km/h

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SJ2006
SJ2006 SJ2006
  • 23-10-2016

with 50 km/h = 15m skid

so, 150 km/h = 45m skid

multiply sides by 3, make them proportional to each other!!!

Answer Link
AL2006
AL2006 AL2006
  • 23-10-2016
Kinetic energy = (1/2 m) x (speed)²

A car moving 3 times as fast has 9 times as much kinetic energy.

If the force of friction between the tires and the ground
is the same at every speed, then the car has to go 9 times
as far to burn off the increased kinetic energy.

    9 x 15m  =  135 meters
Answer Link

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