# A block of mass 3 kg starts from rest and slides down a surface, which corresponds to a quarter of a circle of 1.6 m radius. a) If the curved surface is smooth, calculate the speed of the block at the bottom. b) If the block’s speed at the bottom is 4 ms−1, what is the energy dissipated by friction as it slides down? c) After the block reaches the horizontal surface with a speed of 4 ms−1, it stops after travelling a distance of 3 m from the bottom. Find the frictional force acting on the horizontal surface due to the block.

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