Question

A braking car on dry pavement has a constant acceleration of -6.0 m/s Skid marks
created are 33.3 m long. The driver claims that he was going 36 km/h.
Which of the following statements is true?

Answer 1

Answer:

36 km / hr * (1000 m  / km)  / (3600 sec / hr)  =  10 m/s

2 a s = Vi^2        relation between initial velocity and acceleration

s = 10^2 / (2 * 6) = 8.3 m  

Should have been able to stop in 8.3 m at 36 km / hr not 33.3 m

Answer 2

Answer:

The driver was lying because he was traveling at least 72 km/h.

Explanation:

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