Question

21. (i) What is kinetic energy.
(ii) Derive a formula for kinetic energy.
(iii) An object of mass 15 Kg is moving with a uniform velocity of 4 m/sec What is
Kinetic energy possessed by the object?
OR
(i) State the law of conservation of energy.
(ii) Name the type of energy possessed by stretched slinky, flowing water, stretche
rubber band and a speeding car.
(iii) An object of mass 50 kg is raised to a height of 600 cm above the ground. What is its
potential energy? (g = 10m/s2)
SECTION-E
nium chloride and common salt?
any one ans​

Answer 1

1.. Kinetic energy is an energy which a body possesses by virtue of being in any motion..

2.. The formula for calculating kinetic energy (KE) is KE = 0.5 x mv2. Here M stands for mass, the measure of how much matter is in an object, and V2 stands for the square of the velocity of the object, or the rate at which the object changes its position.

3.. KE = 0.5×15×4×4=120joule

Answer 2

Kinetic energy is the energy possess by an object due to its motion

Q 21

ii) part is in the attachment

iii) K E = 1/2 mv^2

here m=15

v = 4

KE =1/2 × 15 × 4

= 30 J

hope u get it