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How much force does a 1 kg rock dropped from 5 m exert on the ground?
Please show work
The answer is not 49 N, I submitted it and it was incorrect.
1 Answer
- OldPilotLv 77 years ago
We need to know the time or distance it takes to stop the rock.
If we know the time, then
It is a Momentum/Impulse problem
d = 0.5At^2
5 m = 0.5 * 9.8 m/s^2 * t^2
t^2 = 5/4.9 ~~~ 1
t = 1 s
V = At = 9.8 * 1 = 9.8 m/s
p = m*V = 5 kg * 9.8 m/s = F * time to stop
If we know distance to stop it is a Work/Energy problem
KE = 0.5MV^2 = 0.5 * 5 kg * 9.8^2 = F * distance to stop
