Find the work done by the Lorentz force.

A particle of mass 6 kg moves accordings to the law x=0.2 t^2-0.02 t^3 . Find the work done by the force in first 4 sec.

What is the work done by centripetal force ?

A particle of mass 100g is thrown vertically upwards with a speed of 5 m/s. What is the work done by the force of gravity during the time the particle goes up ?

Explain when work is done by the test charge