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The image shows a page from a test booklet titled "Early Exam in Physics 2026" in Russian. It contains four physics problems. Problem 1: A graph shows the velocity projection of a body over time. The task is to determine the acceleration projection of the body in the time interval from 4 to 5 seconds, and provide the answer in m/s². Problem 2: A graph shows the relationship between the modulus of the elastic force and the extension of a spring. The task is to find the stiffness of the spring and provide the answer in N/m. Problem 3: A body moves rectilinearly. Under the action of a constant force of 3.5 N, directed along the straight line, the momentum of the body increases in 5 seconds. The task is to determine the change in momentum and provide the answer in - m/s. Problem 4: A wooden block with a volume of 0.02 m³ floats in kerosene, submerged to half its volume. The task is to find the buoyant force acting on the block and provide the answer in N.
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