The figure represents a multiflash photograph of a small ball being shot straigh
ID: 2078311 • Letter: T
Question
The figure represents a multiflash photograph of a small ball being shot straight up by a spring. spring, with the ball atop, was initially compressed to the point marked X and released. The ball left the spring at the point marked Y, reaches its highest point at the point marked Z. Assuming that the air resistance was negligible: The acceleration of the ball was greatest just before it reached point Y (still in contact with spring). The acceleration of the ball was decreasing on its way from point Y to point Z. The acceleration of the ball was zero at point Z. All of the above responses are correct. The acceleration of the ball was the same for all points in its trajectory from points Y to Z.Explanation / Answer
The answer is the option (E). When the ball was closer to the point X its acceleration was maximum. Because the spring was in fully compressed state which yield maximum force which means maximum acceleration. When the ball is at point Y the acceleration is less than that at the point X. After it leaves the point Y it has no force acting on it so it has no additional acceleration except the constant gravitation acceleration. When the ball reaches the maximum point Z its velocity is zero but it still has got the gravitional acceleration. So the only correct option is that the acceleration is constant from point Y to point Z. Hence the option is (E).