2 years ago

Calculate the kinetic energy of a car of mass 800kg moving at 100 kmph.

Physics

1 answer:

valentina_108 [34]2 years ago

4 0

Answer:

KE = 308642.02469136 J

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B) how long does it take to be lifted out at maximum acceleration if it started from rest

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let +y is upward. look below at the free body diagram. the mass M refers to the combined mass of the boulder and chain.

the weight of the chain is: $w_{c} =m_{c} g$ and maximum tension is $T=2.50 m_{c} g=1.41*10^4N$

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$w_{M} =1.2650*10^4N$

∑ $F_{y} =ma_{y}$

$T-M_{g} =Ma_{y}$

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$=0.645m/s^2$

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to solve for t

$t=\sqrt{2(y-y_{0} )/a_{y} }$

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