A stone is whirled in a circle and then released so that it moves in a straight line…
PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
A stone is whirled in a circle and then released so that it moves in a straight line with a certain speed.
Answer the following questions about the stone:
(i) Write the mathematical expression for the kinetic energy of a body of mass m moving with speed v.
(ii) The stone possesses 90J of kinetic energy while moving with a speed of 6m/s. Calculate the mass of the stone.
(iii) The speed of the same stone is later reduced to 3m/s. Determine its new kinetic energy.
(iv) Using your answers to parts (ii) and (iii), state how the kinetic energy of a body depends on its speed when the mass remains constant.