An object has a kinetic energy of 275 j and a momentum of magnitude 25.0 kg · m/s. find the (a) speed and (b) mass of the object.

Kinetic energy = momentum^2 / 2 x mass

Mass = (momentum^2 / Kinetic energy) / 2

Mass = (25^2 / 275) / 2

Mass = 1.136 kg.

momentum = mass x velocity

velocity = mass / momentum

velocity = 1.136 / 25

velocity = 0.04544 m/s