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 The natural length of a spring is 10 cm


 The natural length of a spring is 10 cm. A force of 25 N stretches it to a length of 20cm. How much work, in units of N-cm, is done in stretching it from a length of 10cm to a length of 15cm? Hooke's law for a spring is given by f=kx, where f is the force, x is the distance the spring is stretched, and k is a constant.

2. Find the slope of the tangent to the curve of y-in (25x+3) at x=2

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