A boy moves down a waterslide from a height of 10 meters. What is his velocity when he hits the water at the bottom of the slide? Assume
zero friction on the slide.

If there is no friction, use energy conservation.  Set the potential energy at the top equal to the kinetic energy at the bottom.

mgh = mv2/2

gh = v2/2

v = √(2gh)

g = 9.8 m/s2

h = 10 m

Plug in the numbers and get v in m/s.

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