a) ¿Qué ángulo en radianes es subtendido por un arco de 1.50 men la circunferencia de un círculo con 2.50 m de radio? ¿Cuánto es es-to en grados? b) Un arco de 14.0 cm de longitud en la circunferenciade un círculo subtiende un ángulo de 1288. ¿Qué radio tiene el círculo?c) El ángulo entre dos radios de un círculo con 1.50 m de radio es0.700 rad. ¿Qué longitud tiene el arco delimitado en la circunferen-cia por estos dos radios?

the velocity you are looking for is made up of two parts: horizontally velocity, vh, and its vertical velocity, vv. the actual velocity of the ball will be these two parts added together, and because velocity is a vector then they will need to be added vectorially.  

neglecting air resistance etc etc.,  

the horizontal velocity component will be constant (because there is no accelerating force in the horizontal direction.  

vh = 8 ms-1  

the vertical velocity component has an accelerating force: 'g'.  

using v = u +at where a = g = 9.81 ms-2.  

the vertical component of velocity, vv = 0 + gt = vv =9.81 x 2  

vv = 19.62 ms-1 . the zero appears because the virtical component of velocity at time t=0 is zero. remember, the ball was thrown horizontally.  

how fast it will be moving (it actual path (being a parabola )) will be the vector sum of these two.  

adding vectorally gives: -  

v = sqr root (8^2 + 19.62^2) = sqr root(64+384.9) = 21.18 or 21.2 ms-1

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

answer is slate

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