Question

por favor alguém de bom coração​

Answer 1

$d = 1,0km \cdot 1000 = 1000m\\t = 500s\\m = 15000mg \div 10^{6} = 0,015kg\\\\d = vt\\v = \frac{d}{t}\\v = \frac{1000}{500}\\v = 2m/s\\\\E_c = \frac{mv^2}{2}=\frac{0,015 \cdot 2^2 }{2}=0,015 \cdot 2 = 0.03J = 3 \cdot 10^{-2}J$