please help At time t = 0 s, an object is observed to be at x = 0 m; and its pos

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please help

At time t = 0 s, an object is observed to be at x = 0 m; and its position along the x axis follows the expression: x = -3t +t3, where the units for distance and time are meters and seconds, respectively. What is the object's displacement Delta x between t = 1.0 s and t = 3.0 s? A) +20 m B) -20 m C)+10m D)+2 m E)-2 m A car starts from rest and accelerates at a constant rate along a straight line. In the first two seconds the car covers a distance of 8.0 meters. How fast is the car moving at the end of the second second? A) 4.0 m/s B) 16.0 m/s C) 2.0 m/s D) 32.0 m/s E) 8.0 m/s You drive for 30 min at 100 km/h and then stop for 15 min. You then drive for 45 min at 80 km/h. Your average speed for the entire trip is (please note that NO conversion to m/s is needed) A) 73 km/h B) 83 km/h C) 88 km/h D) 90 km/h E) 97 km/h

Explanation / Answer

1.A)20 m

2.E)8 m/s

3.A)73 km/gr

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