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m= 20 g ---> 20/1000= 0,02 Kg
Ek= 2500 J
Dit:
v=..?
Penye:
Ek= 1/2×m×v²
1/2×m×v²= Ek
1/2×0,02×v²= 2500
0,01×v²= 2500
v²= 2500/0,01
v²= 250000
v=
v= 500 m/s