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A round stone rolls towards the edge of 21 meter cliff. As it reaches the edge of the cliff, it is moving forward with a speed of 6.7 m/s. How far, horizontally, from the cliff face will the rock land?
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30 votes
30 votes
A round stone rolls towards the edge of 21 meter cliff. As it reaches the edge of the cliff,

it is moving forward with a speed of 6.7 m/s. How far, horizontally, from the cliff face
will the rock land?

User Cubed Eye
by
3.0k points

1 Answer

21 votes
21 votes

Answer:

13.9 m

Step-by-step explanation:

Find time to fall vertically from 21 m to ground then multiply this TIME by the horizontal rate of 6.7 m/s

d = 1/2 a t^2

21 = 1/2 (9.81) t^2 shows t = 2.069 s

2.069 s * 6.7 m/s = 13.9 m

User Blackcatweb
by
2.6k points
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