Question

a car is traveling at a constant velocity of 60 km/h east for 4 hours. choose the correct statement about the acceleration of the car. a the acceleration of this car is zero. b the acceleration of this car is positive. c the acceleration of this car is negative. d the acceleration of this car is 15 m/s.

Explanation:

Acceleration is the rate of change of velocity. If a car travels at a constant velocity (both magnitude and direction are constant), the change in velocity ($\Delta v$) is zero. Using the formula for acceleration $a = \frac{\Delta v}{\Delta t}$, when $\Delta v = 0$, the acceleration $a$ is zero. The car here has a constant velocity of 60 km/h east, so its acceleration is zero. Option B is incorrect as there's no increase in velocity, option C is incorrect as there's no decrease, and option D has incorrect units (acceleration units should be m/s², and the value is also wrong as velocity is constant).

Answer:

A. The acceleration of this car is zero.