Question

Define Kinetic Energy. Write expression for Kinetic Energy.A force of 12N acts on an

object of mass of 4kg in the state of rest for 3s. Calculate the kinetic energy acquired by the

object.​

Answer 1

Kinetic energy , form of energy that an object or a particle has by reason of its motion.

mass = 4kg

force = 12N

time = 3s

u = 0

if a is acceleration produced in the body

a = F/m

a = 4/3 m/ s

let v be velocity of body after 3s

v = u+at

0+4/3×3

v = 4m/s

KE = 1/2 mv^2

1/2 × 4 × 4 ×4

KE = 16 j