Question

III. Answer the following questions in two or three sentences:
3x2=6
8.An object of mass 40 kg is raised to a height of 5m above the ground. What is its potential energy?
If the object is allowed to fall find its kinetic energy when it is balf way down
9. The frequency of a source of sound is 100Hz. How many times does it vibrate in a minute?
10. A certain household has consumed 250 units of energy during a month. How much energy is this
in joules?​

Answer 1

Answer:

1960J

Explanation:

GIVEN:

mass of the object=40kg

height of the object from the ground=5m

Acceleration due to gravity=9.8m/s^2

To solve:

Potential energy of the object=?

SOLUTION:

P.E=mgh

=40×9.8×5

=1960J