5. [A2] A function h(t) models the height of a baseball when Mr. Kim throws it into the air. The function Mt) = 5t2 + 20f + 1 represents height in metres and t represents time in seconds. The derivative of the function h(t) is given by h'(t) = 10t + 20. Determine the height of the baseball when its speed is zero. Round your answer to one decimal place if necessary