Question

On a 3 m ledge, a rock is lying atthe potential energy of 120 J. What will be the mass of the
rock?

Answer 1

Explanation:

For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters. Notice that gravitational potential energy has the same units as kinetic energy, kg m2 / s2.

Answer 2

Answer:

m=P.E./(g*h)

=120J/(9.8*3)

=120/29.4

=4.08kg

Explanation:

PE = 120 J, h = 3m, g = 9.8 m/s2(Gravitational Acceleration of the earth).