A block enters a horizontal smooth spiral track in which the radius of the track decreases from 10 m to 5m. If the block enters the spiral at a speed of 10 m/s, what is it's speed at the end of the spiral?

Engineering

Physics

Conservation of Energy

Circular Motion in Vertical Plane

Question

A block enters a horizontal smooth spiral track in which the radius of the track decreases from 10 m to 5m. If the block enters the spiral at a speed of 10 m/s, what is it's speed at the end of the spiral?

20 m/s

5 m/s

10 m/s

$5 \sqrt{2}$ m/s

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Energy is conserved ⟹ v_i = v_f