麻烦给下这道题的详细过程 谢谢啦
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说明:^——表示次方
a=6t-4
dv/dt=6t-4
dv=(6t-4)dt
v=∫(6t-4)dt
=6/2t^2-4t+C
=3t^2-4t+C
t=2s时,v=1m/s
3×2^2-4×2+C1=1
12-8+C1=1
C1=-3
v=3t^2-4t-3
dx/dt=3t^2-4t-3
dx=(3t^2-4t-3)dt
x=∫(3t^2-4t-3)dt
=3/3t^3-4/2t^2-3t+C2
=t^3-2t^2-3t+C2
t=2s时,x=6m
2^3-2×2^2-3×2+C2=6
8-8-6+C2=6
C2=12
x=t^3-2t^2-3t+12
a=6t-4
dv/dt=6t-4
dv=(6t-4)dt
v=∫(6t-4)dt
=6/2t^2-4t+C
=3t^2-4t+C
t=2s时,v=1m/s
3×2^2-4×2+C1=1
12-8+C1=1
C1=-3
v=3t^2-4t-3
dx/dt=3t^2-4t-3
dx=(3t^2-4t-3)dt
x=∫(3t^2-4t-3)dt
=3/3t^3-4/2t^2-3t+C2
=t^3-2t^2-3t+C2
t=2s时,x=6m
2^3-2×2^2-3×2+C2=6
8-8-6+C2=6
C2=12
x=t^3-2t^2-3t+12
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