An object is shot straight up from the ground with an initial velocity of 20 m/s. How high above the ground is the object one second after it reaches its maximum height? Neglect air resistance." I got the maxiumum height of 20.41 m but I used it into the y(t) = y0 + v0t - 1/2gt^2 equation and I don't think I got it righ

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(a) A soccer player kicks a rock horizontally off a 35 m high cliff into a pool of water. If the player hears the sound of the splash 2.84 s later, what was the initial speed given to the rock (in m/s)? Assume the speed of sound in air is 343 m/s. m/s (b) What If? If the temperature near the cliff suddenly falls to 0°C, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to hear the sound of the splash 2.84 s after kicking the rock? m/s Need Help? Read It Watch It

Please use these equations to solve the problem:  v=v0+at  x=x0+v0t+1/2at2 Part A:  A stone is thrown upwards from the edge of a cliff 18 m high. It just misses the cliffon the way down and hits the ground below with a speed of 18.8 m/s. (a) With what velocity wasit released? (b) What is its maximum distance from the ground during its flight? Part B:  A rocket is fired vertically upward with an initial velocity of 80 m/s. It acceleratesupward at 4 m/s2 until it reaches an altitude of 1000 m when its engines fail and it enters free fall.(a) How long is the rocket in motion? (b) What is its maximum altitude? (c) What is its velocityjust before it crashes back into the earth? Part C:  A car moving at a constant speed of 30 m/s suddenly stalls at the bottom of a hill.The car undergoes a constant deceleration of 2 m/s2 while ascending the hill. (a) Write equationsfor the position and velocity as functions of time, taking x = 0 at the bottom of the hill. (b) Whatis the maximum distance…

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Juliet is standing in front of a wall and Romeo is at a window above her at a height of 3.61 m from the ground. Juliet tosses a box of candy straight up with speed 7.50 m/s from a height of 1.53 m above the ground. Ignore any effects due to air resistance. To receive full marks, you must include a diagram showing the physical situation and your choice of coordinate system. (a) Will the box reach Romeo? O Yes O No (b) If so, what is the box's speed when it reaches Romeo? If not, what initial speed must the rock have to reach Romeo? m/s

Find the components of tot along the x and y axes in the figure below, where 8 = 21.0° and tot Vtot, x V tot, y = = + Vtot = VA + VB УА VB A Vtot 26.5° 23.0% VA X = 7.60 m/s.

The elevations of the ski jumping hill shown below are as follows: hA = 49 m hg = 3.5 m hc = 5.2 m If the velocity of a ski jumper is measured to be 25.4 m/s at position B, what will be the launch velocity (in m/s) at position C [round your final answer to one decimal place]? A hA C B hc nB