A person, standing at the edge of a cliff overlooking the ocean, throws a stone with an initial speed of 20 m/s at an angle of 30o below the horizontal. If the stone is in flight for 2s, the height of the cliff is a.) 19.6 m b.) 14.9 m c.) 4.9 m d.) 5.1 m

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Chapter3: Motion In Two Dimensions
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Problem 33AP: A boy throws a baseball onto a roof and it rolls back down and off the roof with a speed of 3.75...
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A person, standing at the edge of a cliff overlooking the ocean, throws a stone with an initial speed of 20 m/s at an angle of 30o below the horizontal. If the stone is in flight for 2s, the height of the cliff is

a.) 19.6 m
b.) 14.9 m
c.) 4.9 m
d.) 5.1 m
Expert Solution
Step 1

(given)

  Initial speed of stone = 20 m/s

Time of flight of stone = 2 s

                                 θ = 30°

vix= vi sin 30°     =(20 m/s)×12     =10 m/s viy=0

 

 

 

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