- #1

IDK10

- 67

- 3

## Homework Statement

A motor lifts a block of mass 0.050kg at a constant velocity of 0.40m s

^{-1}. The current in the motor ia 85mA and the potential difference across it is 3.0V. Calculate the efficiency of the motor

## Homework Equations

E

_{k}= 1/2 x mv

^{2}

Electrical power = VIt

## The Attempt at a Solution

Ig to the electrical power as 0.255W, and kinetic energy of the block as 0.004J. But how do I get the power of the block, or the electrical energy of the motor?