When does the velocity and speed of a moving body becomes identical?

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

What is a good example of instantaneous speed

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?