Advertisements
Advertisements
प्रश्न
Two bodies of equal masses are moving with uniform velocities v and 2v. Find the ratio of their kinetic energies.
Advertisements
उत्तर
K.E = `1/2 mv^2`
K.E = `1/2 m (2v)^2`
K.E = `(1/2 mv^2) xx 4`
∴ Ratio of their K.E = `(1/2 mv^2)/(4(1/2 mv^2))`
= `1/4`
= 1 : 4
Ratio of K.E. of A and B is 1 : 4.
APPEARS IN
संबंधित प्रश्न
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same?
Give reasons for the following A horse and a dog are running with the same speed. Which one of them has more kinetic energy than the other.
A body of mass 60 kg has the momentum 3000 kg m s-1. Calculate:
- the kinetic energy.
- the speed of the body.
On what factors does the kinetic energy of a body depend?
Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car :
Find out the form of energy possessed by the following thing.
Water falls
The energy possessed by a cricket ball bowled by a player is ______.
What is energy of motion? Give examples.
When the speed of a moving object is doubled, then its kenetic energy ______.
