A block is suspended from a ceiling by a spring stretched 20 cm. When the block moves vertically , such motion is described by the equation y = ( - 0.2 + 0.3 Sin ( wt + θ ) ) m , determine the speed ( in m / s ) of the block when it passes through the position y = 0.1 m . g = 10m/s²

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.