A rock tumbles straight down from a cliff, its moving at 20 m/s when it hits. What is the height of the cliff? The mass of the rock is 8 kg.
a) 2.5 m
b) 400 m
C) 20.4 m
d) 160 m
3 answers
What's the time?
v = g t
20 = 9.81 t
t =2.03 seconds
h = (1/2) g t^2
h = 4.9 (2.03)^2
h = 20.4 meters
20 = 9.81 t
t =2.03 seconds
h = (1/2) g t^2
h = 4.9 (2.03)^2
h = 20.4 meters
yolo
2 answers