A large boulder is ejected vertically upward from a volcano withan initial speed of 40.0 m/s. Ignore air resistance. When is the velocity of the boulder zero?

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A large boulder is ejected vertically upward from a volcano with
an initial speed of 40.0 m/s. Ignore air resistance. When is the velocity of the boulder
zero?

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Step 1

t=uy-vygvy=0t=409.8=4.08s

 

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