### What will a spring scale read for the weight

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Q. What will a spring scale read for the weight of a 57-{rm kg} woman in an elevator that moves upward with constant speed of 5.2 m/s?

Q. An airoplane takeoff speed is 320km/h. if its average acceleration is 2.9m/s^2, how long is it on the runway after starting its takeoff roll?

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