Question

Q-1)Derive an expression for Kinetic energy of the body ? Calculate the Kinetic energy for a body of mass 5kg moving with a velocity 2.5 m/s².

Q-2)Why metals are electropositive and non metals are electronegative in nature ?( According to 5 marks )

# Need best answers apas.

Answer 1

HELLO DEAR,



-----------------------(1)--------------------------


let an body of mass "m"
moving with initial volocity "v"

and
A constant force act on it "F" with velocity changes to "v"

we know that:-

F=ma------(1)

and

work done = (force) × (displacement)

from --(1)

W = ma ×(s)-------(2)

Newton's third law:-

v² - u² = 2as

$s = \frac{ {v}^{2} - {u}^{2} }{2a}$

put in Equation----(2)


we get,

$w = ma \times \frac{ {v}^{2} - {u}^{2} }{2a} \\ \\ = > w = \frac{1}{2} m( {v}^{2} - {u}^{2} ) \\ \\ when \: u = 0 \\ \\ = > w = \frac{1}{2} m {v}^{2} \\ \\ work \: done = kinetic \: energy \\ \\ k = \frac{1}{2} m {v}^{2}$




--------------------------(2)---------------------------


➡️The tendency of metals to lose electrons inorder to get stability is called electropositive nature of metals.

most of metals can loose their electrons from there valence shells cause week force of attraction on outermost electron⬅️


➡️the tendency of non - metal to loose their bonding electrons towards itself is called electronegativity.

non - metal have less no. of electrons than the
required electrons in the valence shell it possesses Less force in comparison to metal⬅️


I HOPE ITS HELP YOU DEAR,
THANKS

Answer 2

Answer:

k = 1/2 mv^2

Explanation:

HOPE MY ANSWER WOULD BE HELPFULL ......