5. A car travels at a constant speed of 40ms-' in a straight line along a horizontal racetrack.At time t= 0, the car passes a motorcyclist who is at rest. The motorcyclist immediately sets off to catch up with the car.The motorcyclist accelerates at 4ms2 for 15s and then acceler...
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命题角度2位移差公式 Δx=aT^2 的应用例2如图2-3-8是某监测系统每隔2.5s拍摄的关于卫星发射起始加速阶段火箭的一组照片,已知火箭的长度为40m。现在用刻度尺测
Answer to: You throw a small stone straight upward at 40 m/s. (a) How high will it rise? (b) How long does it take to reach its maximum height? By...
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At 6:40 a.m., she was already waiting in her family's car. There are four people in her family-Jennifer, her husband and their two lovely children. At 7:30 a.m., Jennifer sends the students to school. Then she cleans the school bus. "I often find lots of stationery( 文具) on...
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1. He often goes home.at 4: 40 p. m..(对画线部分提问)home?2. It's time for lunch. (改为同义句)It's iime3. My father works at a bus station. ()father?4. Lily's grandm a eats a lot of vegetables and chicken for lunch. (对 线部分提Lily's grandm a for lunch?5....
A body moving at 40 m/s accelerates at the rate of 8m/s2. What is the distance it transverses in 15 seconds? Horizontal Motion: Projectile motion formulas for the horizontal motion can be expressed in terms of the general equation: x=x0+v0c...
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