Question

HELP!!!!This question is typical on some driver's

license exams: A car moving at 49 km/h skids
12 m with locked brakes.
How far will the car skid with locked brakes
at 122.5 km/h? Assume that energy loss is
due only to sliding friction.
Answer in units of m.

Answer 1

d=75 m

Step-by-step explanation:

Before Skidding

`v^2-v_o^2=2ad`

`0^2-49^2=2a(12)`

After Skidding

`v^2-v_o^2=2ad`

`0^2-122.5^2=2ad`

`(49^2)/(122.5^2)=(12)/(d)`

`d=75 m`

Hope it helps