The electric field in a region of space is given bye((100508s/ note, this electric field can not be generated by a static charge, we're just playing with vector functions. a)compute the electric field at a point 5m along the positive r-axis. (b)compute the strength(magnitude) of the electric field at this point.

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