Can someone help me with Q5?

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?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?