Advertisements
Advertisements
प्रश्न
If the speed of a car is halved, how does its kinetic energy change?
Advertisements
उत्तर
K.E = `1/2 mv^2`
when `v_1 = 1/2 v`
∴ K.E. = `1/2 mv_1^2`
= `1/2 m (1/2 V)^2`
= `1/2 m v^2 (1/4)`
new K.E = `1/4 K.E`
∴ K.E changes to `1/4 th`
APPEARS IN
संबंधित प्रश्न
A ball of mass M is moving with a speed v. What is its kinetic energy?
A bullet of mass 50 g is moving with a velocity of 500 m s−1. It penetrated 10 cm into a still target and comes to rest. Calculate:
- the kinetic energy possessed by the bullet, and
- the average retarding force offered by the target.
A body of mass 60 kg has the momentum 3000 kg m s-1. Calculate:
- the kinetic energy.
- the speed of the body.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
If the speed of a body is halved, what will be the change in its kinetic energy?
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
When stored water falls down, potential energy of water is converted into ______.
The kinetic energy of a given body depends on the ______.
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.
