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m=0.0001g=0,0000001kg
t=0.5s
a=15 m/s².
a=V/t
V=a*t=15m/s²*0,5s=7,5m/s
Ek=m*V²/2=0,0000001kg*(7,5m/s)²/2=0,000002813J=2813nJ