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A 4 kg block slides down a frictionless incline making an angle of 60° with the horizontal.

(a) What is the total work done on the block when the block slides 2 m (measured along the incline)?

(b) What is the speed of the block after it has slid 1.5 m if it starts from rest?

(c) What is its speed after 1.5 m if it starts with an initial speed of 2 m/s?

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