Advertisements
Advertisements
प्रश्न
A ball of mass 0.5 kg slows down from a speed of 10 m s−1 to that of 6 m s−1. Calculate the change in the kinetic energy of the ball.
Advertisements
उत्तर
Mass of ball = 0.5 kg
Initial velocity = 10 m s−1
Final velocity = 6 m s−1
∴ Initial K.E. = `1/2 mv^2`
= `1/2 xx 0.5 xx 10 xx 10`
= 25 J
Final K.E. = `1/2 mv^2`
= `1/2 xx 0.5 xx 6 xx 6`
= 9 J
Change in K.E. = 25 – 9 = 16 J
∴ K.E. decreases by 4 J
∴ The change in the kinetic energy of the ball is 16 J.
APPEARS IN
संबंधित प्रश्न
Kinetic energy = 1/2 × mass × ............
How much work is needed to be done on a ball of mass 50 g to give it a momentum of 5 kg cm s-1?
Two bodies have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125 : 9. Calculate the ratio of their velocities.
On what factors does the kinetic energy of a body depend?
A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, What is the ration of their kinetic energies?
Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.
Find out the form of energy possessed by the following thing.
Water falls
The kinetic energy of a body of mass 4 kg and momentum 6 Ns will be
When the speed of a moving object is doubled, then its kenetic energy ______.
When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.
