Advertisements
Advertisements
प्रश्न
A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h. The correct statement is:
विकल्प
Potential energy of the ball at the ground is mgh.
Kinetic energy to the ball at the ground is zero.
Kinetic energy of the ball at the highest point is mgh.
Potential energy of the ball at the highest point is mgh.
Advertisements
उत्तर
Potential energy of the ball at the highest point is mgh.
Explanation:
At the highest point, the ball momentarily comes to rest, and thus its kinetic energy becomes zero.
APPEARS IN
संबंधित प्रश्न
The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground. Which of the two has greater potential energy?
Write the expression for the gravitational potential energy explaining the meaning of the symbols used.
A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find the work done in lifting the body.
Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.
A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the adjacent fig. When the trolley is released, it is found to move at a speed v = 2 m s-1. What potential energy did the spring possess when compressed?
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
If 784 J of work was done in lifting a 20 kg mass, calculate the height through which it was lifted. (g = 9.8 m/s2)
The potential energy is
