Advertisements
Advertisements
Question
Find the kinetic energy of a body of mass 5 kg moving with a uniform velocity of 10 m s-1.
Advertisements
Solution
Mass of body m = 5 kg
velocity v = 10 ms-1
K.E = `1/2mv^2`
= `1/2 xx 5 xx 10 xx 10`
= 250 J
APPEARS IN
RELATED QUESTIONS
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?
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.
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)
How much work is needed to be done on a ball of mass 50 g to give it a momentum of 5 kg cm s-1?
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
If the speed of a body is halved, what will be the change in its kinetic energy?
Which would have a greater effect on the kinetic energy of an object : doubling the mass or doubling the velocity?
Water stored in water dams possesses 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.
