Abob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. what is the value of the kinetic energy gained by the bob at the ground level? 250 joules 51 joules 79 joules 8.1 joules

We can assume that all gravitational potential energy is converted into kinetic energy of the object.

Hence, GPE = KE

Where GPE is gravitational Potential Energy (J) and KE is Kinetic Energy (J)

GPE = mgh

Where, m is the mass of the object (kg), g is acceleration due to gravity (9.8 m s⁻²) and h is the height to the object from ground (m).

m = 0.18 kg
g = 9.8 m s⁻²
h = 45 m

Hence, 
       GPE = 0.18 kg x 9.8 m s⁻² x 45 m
                = 79.38 J
                ≈ 79 J

Hence, KE = GPE = 79 J

Hence, the answer is '79 joules'.

i think slash and

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).