6 A small box of mass 5 kg is pulled at a constant speed of \(2.5 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) down a line of greatest slope of a rough plane inclined at \(10 ^ { \circ }\) to the horizontal. The pulling force has magnitude 20 N and acts downwards parallel to a line of greatest slope of the plane.
- Find the coefficient of friction between the box and the plane.
The pulling force is removed while the box is moving at \(2.5 \mathrm {~m} \mathrm {~s} ^ { - 1 }\).
- Find the distance moved by the box after the instant at which the pulling force is removed.
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[Question 7 is printed on the next page.]