26. After a mass weighing 10 pounds is attached to a 5-footspring, the spring measures 7 feet. This mass is removedand replaced with another mass that weighs 8 pounds.The entire system is placed in a medium that offers adamping force that is numerically equal to the instanta-neous velocity.(a) Find the equation of motion if the mass is initiallyreleased from a point foot below the equilibriumposition with a downward velocity of 1 ft/s.(b) Express the equation of motion in the form givenin (23).(c) Find the times at which the mass passes through theequilibrium position heading downward.

Given that mass weighing 10 pounds stretches spring by 2 feet. Using Hooke's law, W=kx10=k×2k=5…

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