Please help and explain this problem. Preferably step by step. Thanks!!

A 3000kg train accelerates from rest to a velocity of 30m/s in 10s. The engine's power during this acceleration is ______.

Question

Please help and explain this problem. Preferably step by step. Thanks!!

A 3000kg train accelerates from rest to a velocity of 30m/s in 10s. The engine's power during this acceleration is ______.

anonymous · Answer

I think it is 27kw

anonymous · Answer

energy =power x time

anonymous · Answer

power = energy/time

anonymous · Answer

now the energy you are dealing with in this case is kinetic energy, which is (1/2)mv^2

anonymous · Answer

so$$P=\frac{ \frac{1}{2} (3000) ( 30^2) }{10} Watts$$

anonymous · Answer

then use a claculator to evaluate that

anonymous · Answer

Power=135000W=135kW

anonymous · Answer

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