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Sagot :
Answer:
2)294 3)15
Explanation:
2)E=mv^2/2
E=3×14^2/2
E=3×196/2
E=3×98
E=294 J
3)E=mv^2/2
m=2E/v^2
m=2×750/10^2
m=2×750/100
m=750/50
m=15
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