Đáp án:
1440000J
Giải thích các bước giải:
Quãng đường con ngựa đi được:
s=v.t=36.0,5=18km=18000m
Công của con ngựa:
A=F.s=80.18000=1440000J
Đổi 30 phút = 0,5 giờ
Công của con ngựa là:
A = F.s = 80 * v*t = 80 * 36 * 0,5 = 1440(kJ)
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