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m= 30 gram --> 30/1000= 0,03 kg
Ek= 0,5 joule
Dit:
v=...?
Penye:
Ek= 1/2.m.v²
1/2.m.v²= Ek
1/2×0,03×v²= 0,5
0,015×v²= 0,5
v²= 0,5/0,015
v²= 33,33
v= √33,33
v= 5,77 m/s