một giá nhẹ gắn trệ một tấm ván gỗ khối lượng M đặt trên bàn nhẵn nằm ngang có treo một quả cầu khối lượng m bằng sợi daah dài l . Một viên đạn nhỏ khối lượng m bay ngang xuyên vào quả cầu và vướng kẹt ở đó

Ibelieve the answer is b

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Your answer is 120miles