A metal ball of mass 5 kg falls from a height of 490m. how much time it will take to reach the ground (g=9.8m/s square)​

initial velocity u=0m/s

height h =490 m

mass m=5kg

acceleration due to gravity g=9.8m/s²

we have

s =ut +1/2 at²

h=0×t+1/2×9.8×t²

490=9.8t²

t²=490/9.8

t²=50

t=√50=5√2=7sec approx

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)