Advertisements
Advertisements
Question
Write an expression for the kinetic energy of an object.
Advertisements
Solution
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
RELATED QUESTIONS
What is the kinetic energy of an object?
Kinetic energy = 1/2 × mass × ............
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 10 kg is moving with a velocity 20 m s-1. If the mass of the body is doubled and its velocity is halved, find:
- the initial kinetic energy, and
- the final kinetic energy.
A truck weighing 1000 kgf changes its speed from 36 km h-1 to 72 km h-1 in 2 minutes. Calculate:
- the work done by the engine and
- its power (g = 10 m s-2)
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
On what factors does the kinetic energy of a body depend?
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?
A body starts from rest and is acted on by a constant force. The ratio of kinetic energy gained by it in the first five seconds to that gained in the next five-second is:
The kinetic energy of a given body depends on the ______.
