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A 12 kg rock falls from a cliff and hits the ground in 4 seconds. Ignoring air resistance, what is the rock's speed just before it hits the ground?
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10 votes
A 12 kg rock falls from a cliff and hits the ground in 4 seconds. Ignoring air resistance, what is the rock's speed just before it hits the ground?

User Jagmal
by
3.1k points

1 Answer

13 votes
13 votes

Answer:

Step-by-step explanation:

Given:

V₀ = 0 m/s

m = 12 kg

t = 4 s

g = 9.8 m/s²

________

V - ?

Speed:

V = V₀ + g·t

V = 0 + 9.8·4 = 39.2 m/s

User Dennis Kerrisk
by
2.5k points
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