An initially stationary firework explodes and splits into two fragments that move horizontally in opposite directions. The total kinetic energy transferred to the fragments by the explosion is E. One fragment has mass m and the other one has mass 2m. What is the speed of the fragment of mass m immediately after the explosion?

A force F is applied to a freely moving object. At one instant of time, the object has velocity v and acceleration a.…

The momentum of an object changes from 160 kg m s⁻¹ to 240 kg m s⁻¹ in 2 s. What is the mean resultant force on the o…

A car accelerates in a straight line. A graph of the momentum of the car is plotted against time. What is evaluated b…

The behaviour of a wire under tensile stress may be described in terms of the Young modulus E of the material of the …

In which order of magnitude are the frequencies of electromagnetic waves in the visible spectrum?

If a wave can be polarised, it must be