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...
A ball is thrown vertically upwards with an initial velocity of 20 m/s. How high will
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=...
A (1.61 ± 0.04) × 1010 N m–2 B (1.61 ± 0.05) × 1010 N m–2 C (1.61 ± 0.07) × 1010 N m–2 D (1.61 ± 0.09) × 1010 N m–2 6 A rock on the surface of Mars is projected vertically upwards with an initial speed of 9.4 m s–1 . The rock rises to a height ...
A ball is thown upwards from the ground with an initial speed u. The is at a height of 80 m at two times, the interval being 6s. Find the value of u. View Solution A ball is projected vertically up such that it passes thorugh a fixes point after a time t0 and t2 respectively....
4 A ball A is released from rest at the top of a tall tower. One second later, another ball B is projected vertically upwards from ground level near the bottom of the tower with a speed of 20 m s-'. The two balls are at the same height 1.5 s after ball B is projected.(i) ...
A-level物理试题02
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 =
A. it reaches a certain height and stops B. the force of gravity acts on it C. there is no more force acting on it D. it changes direction on its own 相关知识点: 试题来源: 解析 B。原因:当球被抛向空中时,它会一直向上运动,直到重力作用在它上面并把它拉下来。反馈...
Answer to: A ball is thrown vertically upward with a speed of 17 m/s. How long does the ball take to hit the ground after it reaches its highest...