Is speed a change in position relative to a reference point

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

An object with a mass of 1.5 kg changes its velocity from + 15 m/s to +22 m/s during a time interval of 3.5 seconds. what impulse was delivered to the objects?