Respostas

2013-09-20T17:32:04-03:00
V = Vo + at
40 = 0 + a*16

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a = 2,5m/s²
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V = Vo + at
V = 0 + 2,5 * 5
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V = 12,5m/s
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Energia Cinetica no Instante 5 segundos:

Ec = m * V²/2
Ec = 10 * (12,5)² / 2
Ec = 5 * 156,25

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Ec = 781,25 Joules
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