A uniform continuous line charge with net positive charge Q and length L lies on the x-axis from to . This problem asks about the electric field at a point on the y-axis: (0,a). continuous line charge 1) What is the direction of the x-component of the electric field at (0,a)

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s