Will give 70 points solv fast A truck is pulling a car out of a ditch by means of a steel cable that is 10 m long and has a radius of 5 mm. When the car just begins to move, the tension in the cable is 800 N. How much has the cable stretched? (Young’s modulus for steel is 2 x 1011 N/m2)

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.