When a vehicle takes off abruptly, you will jerk backward. To gain a better comprehension of the process,  you place a box on a frictionless surface at the back of a pick-up truck. There is no mechanism to secure the box. Explain what happens when the pick-up truck takes off.

• A. The box accelerates and increases its velocity backward.
• B. The box does not accelerate but will remain at constant velocity (at rest) until it hits the back of the pick-up.
• C. The box does not accelerate but will remain at a constant velocity, the same as that of the pick-up truck.
• D. The box moves at the same velocity as the truck.

Answer: (B)