Question

An electric motor raises a load of 0.2 kg, at a constant speed, through a vertical distance of 3.0 m in 2 s. If the acceleration of free fall is 10 m/s2, the power in W developed by the motor in raising the load is (a) 0.3
(b) 1.2
(c) 3.0
(d) 6.0

Answer 1

Answer:

d............................

..

.

Answer 2

Answer:

the answer is c 3.0

Explanation:

the formula for power is energy divided by time (energy per unit time). So with what we've been given which is

mass: 0.2

distance/height: 3

time: 2

so using the equation for gravitational potential energy (mass*gravity*height) we can get energy

so that'll be

0.2 * 10 (gravity is always 10 on earth) * 3

which will give you

6

so you do 6 divided by 2 which is your time

to get 3