A ball is thrown vertically upward. At the highest point, the force acting on the ball is: A. zero B. only gravitational force C. only the force of throw D. both gravitational force and the force of throw 相关知识点: 试题来源: ...
百度试题 结果1 题目A ball is thrown vertically upward with a speed of 20 m/s. How high does it reach?相关知识点: 试题来源: 解析 20m 反馈 收藏
2If a ball is thrown vertically upward from the roof of a 48 foot tall building with a velocity of 48 ft/sec,its height in feet after t seconds is s(t) = 48 + 48 t - 16 t^2.What is the maximum height the ball reaches?What is the velocity of the ball when it hits the grou...
If a ball is tossed from ground level upward at a speed of 44 m per s, how long will it take to reach its maximum height? A ball is thrown vertically upward. What is its acceleration at maximum altitude? A ball is thrown from the ground into the air. At ...
A ball is thrown vertically upwards, moves according to the law s=13.8t-4.9t^(2) where s is in metres and t is in seconds. (i) Find the acceleration at t =
Ball A is thrown vertically upward from the top of a30m-high building with an initial velocity of5m/s.At the same instant another ball B is thrown upward from the ground with an initial velocity of25m/s. Part A Determine the...
A ball is thrown vertically upward from the ground with an initial velocity of 115 ft/sec. Use h = -16t^2 + vt + h Determine when the ball will reach its maximum height and what the maximum height is. A rubber ...
A ball is thrown straight up from a height of 5.0 m above the ground with a speed of 20 m/s. a. What is the maximum height it achieves? b. What speed does it have when it is at a height of 7.0 m above the ground? A ...
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i. A ball thrown vertically up takes moretime to go up than to come down. ii. If a ball starts fallig from the position of rest, then it travels a distance of 25m during the third secons of tis fall. iii. A packet dropped from a rising balloon ferst moves upwards and then mov...