certain force acting on 20 Kg mass when its velocity
changes from 5m/s 2m/s. Calculate the change in
Kinetic energy of the object.
Answers
Answer: In this case we want to use two set of steps.
STEP1: We want to find the kinetic energy of first set.
In first set, the velocity=5 m/s2
and mass=20kg
use the formulae,
kinetic energy=1/2mv^2
=1/2*20kg*5*5
=250J
STEP2: We want to find the kinetic energy of the second set.
In second set, the velocity=2 m/s2
and mass=2okg
Use the formulae,
kinetic energy=1/2mv^2
=1/2*20kg*2*2
=40J
To find the change in the kinetic energy of the object subtract the answer from step1 to step 2.
change of kinetic energy of the object = step 1 answer- step 2 answer
=250J-40J
=210J
ANSWER: THE CHANGE OF THE KINETIC ENERGY OF THE OBJECT IS 210J.