The kinetic energy of the ball is maximum at the highest point D. The potential E. nergy of the ball decreases as it goes up 相关知识点: 试题来源: 解析 A。解析:当球竖直上抛时,忽略空气阻力,整个过程只受重力,加速度为重力加速度g,是恒定不变的,A选项正确。在最高点速度为0,但加速度不为0...
2. A ball is thrown vertically upwards with speed u m s-' from a point P at height h metres above the ground. The ball hits the ground 0.75 s later. The speed of the ball immediately before it hits the ground is 6.45 m s'. The ball is modelled as a particle.(a)Show that u=...
题目 5) A ball is thrown vertically upwards with a speed of 29 ms 1. It hits the ground 6seconds later. By modelling the ball as a particle find the height above the ground from which it was thrown 相关知识点: 试题来源: 解析 SUVAT up as positive direction USE 反馈 收藏 ...
It rises to the top of its path before beginning to fall vertically downwards. top of path midpoint of path starting position Assume that the gravitational potential energy of the ball is zero at its starting position. Which statement about the ball is not correct? A As it rises, its ...
When you throw a ball vertically upwards, at the highest point of its trajectory, which of the following statements about its velocity and acceleration is correct? A. Velocity is zero and acceleration is zero B. Velocity is zero and acceleration is not zero C. Velocity is not zero and ...
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 =
百度试题 结果1 题目 A ball is thrown upwards and its height, h metres, above ground after seconds is given by h=1+4t-5t^2.Write an expression for the velocity of the ball at time t. 相关知识点: 试题来源: 解析 v=4-10t 反馈 收藏 ...
1.A ball is thrown directly upwardswith an initial velocity of 20m/s.Determine the ball’s maximum height and thetime it will take for the ball to fall from its maximum height to the ground.(10 marks)2.A man hauls a 20kg stone thatis currently resti
A-level物理试题02
When a ball is thrown in the air, which of the following describes the upwards motion to the point of greatest height:A.Kinetic energy is converted entirely to potential energyB.Potential energy is converted entirely to kinetic energyC.Kinetic energy is