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 ball is thrown upward and its height h at time t can be modeled by a quadratic function. If h = at² + bt + c, and when t = 0, h = 1. Which of the following must be true? A. a = 1 B. b = 1 C. c = 1 D. None of the above 相关知识点: 试题来源: 解析 ...
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 ...
26 A small ball is thrown into the air from a point that is I m above horizontal ground.The ball moves vertically upwards so that at time t seconds after the ball was thrown, the height, h metres, of the ball above the ground is given by h=1+kt-5t^2 where k is a constant....
Homework Statement A 4.0kg ball is thrown vertically up into the air with an initial velocity of 8.5ms−1 . By the time it is height h metres above the...
Answer to: A ball is thrown in the air. Its height, h m, at any time t seconds is given by: h = 5t (4 - t) What is the maximum height reached by...
Question: In the figure here, a ball is thrown up onto a roof, landing 4.00s later at height h=20.0m above the release level. The ball's path justbefore landing is angled at θ=58.0° with the roof. (a) Find the ...
At slightly higher speeds, the balls are projected short distances across the mill, and at still higher speeds they are thrown greater distances and considerable wear of the lining of the mill takes place. At very high speeds, the balls are carried right round in contact with the sides of ...
2. A tennis ball is thrown vertically downwards from a height of 0.65 m above the ground. It leaves the hand with an initial speed of 1.5 m s1. The ball rebounds and is caught when it is travelling upwards with a speed of 1.0 m s-1.Assume that air resistance is negligible.(a) ...
A ball thrown up from the ground reaches a maximum height of 20 m Find... 05:08 A body is projected from the bottom of a smooth inclined place with a ... 03:25 A ball is dropped from an elevator at an altitude of 200 m (Fig.4. 39)... 04:50 A particle is projected vertical...