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 ______.

Answer 1

I think it is 27kw

Answer 2

energy =power x time

Answer 3

power = energy/time

Answer 4

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

Answer 5

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

Answer 6

then use a claculator to evaluate that

Answer 7

Power=135000W=135kW

Answer 8

Please post these in the PHYSICS section...