A block of mass $6{\text{ }}kg$ is sliding down a line of greatest slope of a plane inclined at ${8^ \circ }$ to the horizontal. The coefficient of friction between the block and the plane is 0.2.
a) Find the deceleration of the block.
b) Given that the initial speed of the block is $3{\text{ }}m{\text{ }}{s^{ - 1}}$, find how far the block travels.
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