At an accident scene on a level road, investigators measure a car's skid mark to be 84 m long. It was a rainy day and the coefficient of friction was estimated to be 0.36.

Question

06-12-2020
Mathematics

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At an accident scene on a level road, investigators measure a car's skid mark to be 84 m long. It was a rainy day and the coefficient of friction was estimated to be 0.36.

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alirazasaulat alirazasaulat · Answer 1 · 2020-12-06T07:45:53+01:00

Answer:

Step-by-step explanation:

We know:

KE=12mv2=Fd

KE=

2

1

mv

2

=Fd

Where Fd=umgdFd=umgd Thus,

12mv2=umgd

2

1

mv

2

=umgd

12v2=ugd

2

1

v

2

=ugd

v2=2ugd

v

2

=2ugd

v=2ugd−−−−√

v=

2ugd

v=2(0.3)(9.81)(78)−−−−−−−−−−−−−√

v=

2(0.3)(9.81)(78)

v=21.4m/s

v=

21.4m/s

Part B

The cars mass does not matter because we can see that the mass cancels out from both sides of the equation.