Phương trình chuyển động của một chất điểm trong hệ tọa độ Oxy là x =2t (cm); y= 3t2 (cm). Khoảng cách từ chất điểm đến gốc toạ độ tại thời điểm t = 2s là : A. 12, 65 cm. B.40cm. C. 52 cm. D. 7, 21 cm.

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Which of the following are appropriate acceleration units?