The figure below represents a multiflash photograph of a small ball being shot straight up by a spring. The spring, with the ball atop, was initially compressed

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🗣️ Trần Thị Đức hỏi: Cho mình hỏi một câu Mechanics Baseline Test (MBT) - English bài tập về nhà

The figure below represents a multiflash photograph of a small ball being shot straight up by a spring. The spring, with the ball atop, was initially compressed to the point marked P and released. The ball left the spring at the point marked Q, and reached its highest point at the point marked R.

26

Assuming that the air resistance was negligible:

(A) The acceleration of the ball was greatest just before it reached point Q (still in contact with the spring).

(B) The acceleration of the ball was decreasing on its way from point Q to point R.

(C) The acceleration of the ball was zero at point R.

(D) All of the above responses are correct.

(E) The acceleration of the ball was the same for all points in its trajectory from points Q to R.

👩 Đánh giá của giáo viên: Câu này trung bình, mức độ hiểu.

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Câu trả lời hay nhất

🕵 Bạn Ngô Gia Lộc trả lời:

Chọn câu (E): The acceleration of the ball was the same for all points in its trajectory from points Q to R.

From Q to R, the motion of the ball is free fall, which has a constant acceleration due to gravity.

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Các câu trả lời

👤 Phạm Văn Mạnh viết:

Chọn C, The acceleration of the ball was zero at point R.

👤 Trần Văn Lợi viết:

Chọn D, All of the above responses are correct.

👤 Lê Văn Đại viết:

Chọn E, The acceleration of the ball was the same for all points in its trajectory from points Q to R.

➥ 🗣️ Trần Thị Đức trả lời: Cảm ơn bạn, câu này hình như có trong file doc này Đề của VLTT-03 (Khó và Hay)

👤 Lê Văn Khanh viết:

Chọn B, The acceleration of the ball was decreasing on its way from point Q to point R.

👤 Trần Văn Bách viết:

Chọn A, The acceleration of the ball was greatest just before it reached point Q (still in contact with the spring).

👤 Nguyễn Anh Đức viết:

Chọn E: The acceleration of the ball was the same for all points in its trajectory from points Q to R.

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