Work Energy and...

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is

A body of mass 5 kg moving with a velocity of 10m/s collides with another body of mass 20 kg at, rest and comes to rest. The velocity of  the second body due to collision is

A body failing from a height of 10m rebounds from hard floor. If it loses 20% energy in the impact, then coefficient of restitution is

A body of mass ‘M’ collides against a wall with a velocity v and retraces its path with the same speed. The change in momentum is

Two ball of same temperature collide which is conserved?

The power of a pump, which can pump 200 kg of water to a height of 200 m in 10 sec, is

If the momentum of a body is increased by 100%, then the percentage increase in the kinetic energy is

Two bodies moving towards each other collide and move away in opposite directions. There is some rise in temperature of bodies because a part of the kinetic energy is converted into

The decrease in the potential energy of a ball of mass 20 kg which falls from a height of 50 cm is

A force of 5 N acts on a 15 kg body initially at rest. The work done by the force during the first second of motion of body is

The slope of the kinetic energy versus position vector gives the rate of

A ball of mass m moves with speed v and strikes a wall of having infinite mass and it returns with same speed then the work done by the ball on the wall is

A wire is stretched under a force. If the wire suddenly snaps the temperature of the wire is

A man pushes a wall and fails to displace it. He does

A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is \(\frac{mv^2}{r}\) and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle?

A 50kg man with 20kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

A spring 40 mm long is stretched by the application of a force. If 10 N forces required stretching the spring through 1 mm, then work done in stretching the spring through 40 mm is

When two surfaces are coated with a lubricant, then they

When a body is moving on a surface the force of friction is called