Let's find the train's displacement from point A when it reaches point C. We should calculate the area of the trapeze ADEC:
S1=260+120⋅20=1800 m.
Now let's find the train's displacement from point A when it reaches point B. We should calculate the difference of areas of the trapeze ADEC and trapeze FGHB:
S2=S1−250+30⋅10=1800−400=1400 m.
Let's find the trains acceleration each time its speed changes.
0⪕t⪕20, a1=2020−0=1 m/s2.
80⪕t⪕120, a2=400−20=−0.5 m/s2.
150⪕t⪕160, a3=10−10−0=−1 m/s2.
190⪕t⪕200, a4=100−(−10)=1 m/s2.
Comments
Its absolutely right
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