7. A baseball player runs from home plate to first base, a distance of 90 feet.

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7. A baseball player runs from home plate to first base, a distance of 90 feet.The graph shows the displacement of the player over time. https://tcan4424-oakcliff-ccl.gradpoint.com/Resour...

What is the approximate average speed of the player's run to first base?

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8. Over a span of 6.0 seconds, a car changes its speed from 89 km/h to 37 km/h. What is its average acceleration in meters per second squared (m/s2)?

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May 17th, 2015

7) About 20 ft/s.

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May 17th, 2015

can you answer number 8 too please...

May 17th, 2015

Sure, give me just a second.

May 17th, 2015

Avg acceleration is defined by the formula:

dAcceleration/time, or, the change in acceleration over a period of time.

Here we have to convert from km/h to m/s:

89 km/hr * 1000m/1km = 89000 m/hr * 1 hr/60 min * 1min/60s = 24.722 m/s

37 km/hr * 1000m/1km * 1hr/60 min * 1 min/60s = 10.277 m/s

So the avg acceleration formula is:

vf-vi/t= (10.277 m/s - 24.722 m/s)/6s = -2.407 m/s/s, depending on how picky your instructor is with sig figs :)

May 17th, 2015

I'm so sorry that took so long, but I wanted to make sure that you had each and every step. It takes a moment to type it all up :)

May 17th, 2015

Ok. Both answers resolved here.

May 17th, 2015

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