How fast is the top of the ladder moving toward the ground


1Q: Suppose a 20-meter ladder is leaning against a wall, and the top of the ladder is 10 meters high. If the bottom of the ladder is sliding away from the wall at a rate of 0.9 meters per second, how fast is the top of the ladder moving toward the ground?

2Q: A cylindrical tank is designed with a radius of 6 meters and a length of 8 meters. If the calculation of the volume of the tank is only accurate to within (+-) 6m^3, how accurate is the measurement of the radius?

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Mathematics: How fast is the top of the ladder moving toward the ground
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