List of top Physics Questions on work, energy and power asked in LPUNEST

For the following question, enter the correct numerical value up to TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numerical value 5 will be written as 5.00 and 2.346 will be written as 2.35) A mass of 50 kg is raised through a certain height by a machine whose efficiency is 90%, the energy spent is 5000 J. If the mass is now released, its KE on hitting the ground shall be _____ J

A particle at rest on a frictionless table is acted upon by a horizontal force which is constant in magnitude and direction. A graph is plotted for the work done on the particle \(W\) against the speed of the particle \(v\). If there are no frictional forces acting on the particle, the graph will look like:

A motor drives a body along a straight line with a constant force. The power \(P\) developed by the motor must vary with time \(t\) as: