Question

A motor has the electrical energy equivalent to 400. joules of work. It can lift a 5.0 kg mass 2.0 meters. Calculate the work done by the motor.

Answer 1

Answer : Work done, W = 98 J.

Explanation :

It is given that,

The electrical energy equivalent to 400. joules of work.

The mass that is lifted by the motor, m = 5 kg

Height, h = 2 m

The work done by the motor is given by :

$W=mgh$

g is acceleration due to gravity

$W=5\ kg\times 9.8\ m/s^2\times 2\ m$

$W=98\ J$

So, the work done by the motor is 98 J

Hence, this is the required solution.  

Answer 2

Work is defined as force*displacement and the force is mass*gravity so roughly 50N and displacement is 2 meters so total work down is 100joules