Work Power & Energy

A wire suspended vertically from one of its ends is stretched by attaching a weight of \(200N\) to the lower end. The weight stretches the wire by \(1\) \(mm.\) Then the elastic energy stored in the wire is

A spring of spring constant \(5 \times {10^3}\,N/m\) is stretched initially by \(5\) \(cm\) from the unstretched position. Then the work required to stretch it further by another \(5\) \(cm\) is

A spring of force constant \(800\) \(N/m\) has an extension of \(5\) \(cm.\) The work done in extending it from \(5\) \(cm\) to \(15\) \(cm\) is

A ball whose kinetic energy E, is projected at an angle of \(45^\circ\) to the horizontal. The kinetic energy of the ball at the highest point of its height will be

If a body looses half of its velocity on penetrating \(3\) \(cm\) in a wooden block, then how much will it penetrate more before coming to rest?