1. If you are driving 100 k m / h along a straight road and you look to the side

Question

1. If you are driving 100 km/h along a straight road and you look to the side for 2.6s

how far do you travel during this inattentive period?

2.A rolling ball moves from

x1 = 9.0cm to x2 = -4.7cm during the time from t1 = 3.3s to t2 = 7.0:  What is its average velocity over this time interval?

3.Two students are asked to find the height of a particular building using a barometer. Instead of using the barometer as an altitude measuring device, they take it to the roof of the building and drop it off, timing its fall. One student reports a fall time of 2.5

s , and the other, 2.8s . What % difference relative to the average of the two measured heights does the 0.3

Explanation / Answer

1.)distance=100*(1000/3600)*2.6m=72.22m.

2)av. velocity=(x2-x1)/(t2-t1)=-3.70cm/s.

3)h1=0.5*g*t1^2=30.625m.

h2=0.5*g*t2^2=38.416m

So av. height=34.5205

So % diff.=(38.416-30.625)/34.5205 * 100%=22.57%

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