A spaceship moving with a velocity of 90m/s come to a complete stop in 18sec. And remains at rest for 12sec. Then it has traveled with a constant of 40m/s for 20sec A) velocity Vs time graph
B) displacement Vs time
C) calculate the total displacement for velocity- time graph

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Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.