Which of the following has the greatest power
A) A weight lifts that lifts as 250N weight 2.1mm 2sec
B) A mechanic's lifts that raises a 1.2×10000 N car 2.1m in 12 sec
c ) A car Engine that does 1.2 × 1000J work in 5sec
D) A crane that lifts a 2.5 × 10000 N beam at a speed of 1.2 m/s

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

Could someone . i have tried to solve myself but my calculation is off

What properties of a moving object are used in determining the object's energy of motion