Advertisements
Advertisements
प्रश्न
Write an expression for the kinetic energy of an object.
Advertisements
उत्तर
If a body of mass m is moving with a velocity v, then its kinetic energy Ek is given by the expression,
`E_k=1/2 mv^2`
Where, m = mass of the object
v = velocity of the object
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.
When an arrow is shot from a bow, it has kinetic energy in it. Explain briefly from where does it get its kinetic energy?
If the speed of a car is halved, how does its kinetic energy change?
A body of mass 60 kg has the momentum 3000 kg m s-1. Calculate:
- the kinetic energy.
- the speed of the body.
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.
A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
Find out the form of energy possessed by the following thing.
Water falls
An apple falling from a tree is an example for kinetic energy.
If the mass as well as the velocity of a body is doubled then the kinetic energy of the body ______ the initial kinetic energy.
