please provide explanations if possible Object A Is In motion relative to object

Question

please provide explanations if possible

Object A Is In motion relative to object B. Which statement about object B is correct? Object B must be at rest relative to the earth. Object B must be in motion relative to the earth. Object B must be at rest relative to object A. Object B must be In motion relative to object A. Which of the following statements does NOT describe an object in uniform motion? K ball is rolling along a table without changing Its speed or direction. An object is dropped and accelerates uniformly toward the earth. An elevator descends three floors at a constant velocity. An elevator sits at rest where g = 9.8 m/s2. A car that was initially traveling west at a speed of 30 m/s2 topped in 6.0 s. What was the car's average acceleration during the 6.0 s Interval? 5.0 m/s2 east 5.0 m/s2 west 0.2 m/s2 east 0.2 m/s2 west Base your answers to questions 4 - 6 on the following information. (Ignore the effects of friction.) After landing on another planet, an astronaut drops a rock from the top of his spaceship. The rock reaches a velocity of 36 m/s in 3.0 s just as It hits the planet's surface. What Is the value of "g" (the acceleration due to gravity) on the planet? + =3. C' 0.083 m/s2 2.0 m/s2 9.8 m/s2 12 m/s2 What was the average speed of the rock during the 3.0 s fall? 12 m/s 18 m/s 36 m/s 72 m/s From what height above the planet's surface was the rock released? 29.4 a 44.1 o (c) 54 m 108 m Three blocks are resting on a table as shown in the diagram below. The weight of each block is given. What Is the net force on Block B? zero 4 N down 5-N-down 5 N up

Explanation / Answer

(6) given that the initial velcoity of the rock is u = 0 m/s Final velocity is v = 36 m/s Time taken to reach the ground is t = 3.0 s From equation of motion acceleration of the rock is            a = (v - u ) / t              = (36 m/s - 0 m/s) / (3.0s)              = 12 m/s2 From equation of motion displacement is           s = ut + (1/2)at2              = 0 + (1/2)(12 m/s2)(3.0s)2              = 54 m    From equation of motion displacement is           s = ut + (1/2)at2              = 0 + (1/2)(12 m/s2)(3.0s)2              = 54 m                 = 0 + (1/2)(12 m/s2)(3.0s)2              = 54 m   

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