ayoismeisjjjjuan
09.11.2019 •
Physics
Arock is dropped from rest from a height h above the ground. it falls and hits the ground with a
speed of 11 m/s. from what height should the rock be dropped so that its speed on hitting the ground
is 22 m/s? neglect air resistance
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Ответ:
E = 0.5mv² + mgh
At release the velocity v = 0 and the height is h.
E = 0 + mgh
At impact the height h = 0 and the velocity is v.
E = 0.5mv² + 0
Since the energy E is conserved:
0.5mv² = mgh
the mass m cancels and the equation becomes:
0.5v² = gh
h = 0.5v²/g
when g = 9.81 and v = 22:
h = 24,66
Ответ: