A 20kg cannonball is fired into a stationary 500kg boulder at on the edge of a 125m high cliff. If the cannonball remains in the boulder and together they land 140m horizontally from the edge of the cliff, what was the initial speed of the boulder?

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11-02-2018
Physics

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A 20kg cannonball is fired into a stationary 500kg boulder at on the edge of a 125m high cliff. If the cannonball remains in the boulder and together they land 140m horizontally from the edge of the cliff, what was the initial speed of the boulder?

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carlosego carlosego · Answer 1 · 2018-02-20T17:35:45-05:00

carlosego carlosego

20-02-2018

Remember that this type of problem can be solved by applying the conservation of the linear amount of movement.
1: cannonball
2: boulder
m1v1i + m2v2i = m1v1f + m2v2f
v1f = v2f = vf (they fall together)
However, in this case we have:
"cannonball is fired into a stationary 500kg boulder"
Thus
v2i = 0
answer:
the initial speed of the boulder was 0 m / s (stationary 500kg boulder)

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