1. At an accident scene on a level road, investigators measure a car\'s skid mar

Question

1. At an accident scene on a level road, investigators measure a car's skid mark to be 78 m long. It was a rainy day and the coefficient of friction was estimated to be 0.36. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes.
m/s

Why does the car's mass not matter?

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2. While throwing a baseball, a pitcher accelerates the ball to 46 m/s across a horizontal distance of 3 m before releasing it. What is the acceleration of the baseball in m/s^2 and in units of g?  m/s^2  g

Explanation / Answer

1 )

1/2mv^2 = mu*m*g*d

v = sqrt(2*mu*g*d)

v = 23.46 m/s

mass cancel out from both side so mass does not matter

2 )

v^2 = u^2 + 2ad

u = 0

46^2 = 2*a*3

a = 352.67 m/s^2

352.67 /9.8 = 35.986g

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