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
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
The energy of a flying kite is kinetic energy.
Kinetic energy = 1/2 × mass × ............
A car is moving with a speed of 15 km h-1 and another identical car is moving with a speed of 30 km h-1. Compare their kinetic energy.
The kinetic energy of a body is the energy by virtue of its ______.
A man drops a 10 kg rock from the top of a 5 m ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground? (g = 10 m/s2)
The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
Find out the form of energy possessed by the following thing.
A rolling ball
Find out the form of energy possessed by the following thing.
Water falls
What are the uses of mechanical energy?
