The sagging of overhead electrical wires is caused by

The property of a body that determines the direction of heat flow when the body is in contact with another body is the

The colours of the visible light region of the electromagnetic spectrum that have the shortest and longest wavelengths respectively are

A ball, P, is released from the roof of a building at the same time as another ball, Q, is thrown vertically upward from the base of the building. Which of the following statements is correct?

A lead bullet of mass 0.05 kg is fired with a speed of 200 m/s into a lead block of mass 0.95 kg at rest. Given that the lead block moves after the impact, determine its kinetic energy.