Advertisements
Advertisements
प्रश्न
If the speed of a body is halved, what will be the change in its kinetic energy?
Advertisements
उत्तर
Kinetic energy of a body is directly proportional to the square of velocity. So, the kinetic energy will become `(1/4)` the initial kinetic energy when velocity is halved .
APPEARS IN
संबंधित प्रश्न
The kinetic energy of an object of mass m moving with a velocity of 5 m s−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
By how much will the kinetic energy of a body increase if its speed is doubled?
Write an expression for the kinetic energy of a body of mass m moving with a velocity v.
Which would have a greater effect on the kinetic energy of an object : doubling the mass or doubling the velocity?
A ball of mass 200 g falls from a height of 5 metres. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/s2)
On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
An apple falling from a tree is an example for kinetic energy.
Explain the types of mechanical energy.
