I need help answering the following.

An object is red vertically umvard with an initial velocity v{l]] = v\" from an initial position s03] = 50. Answer parts a and b below. a. For v = 53.3 mJ's and s\" = 25 n1. nd the position and velocity functions for all times at which the object is above the ground. The velocity function is v{t} = D. The position function is s{t] = Cl. b. Find the time at which the highest point of the trajectory is reached and the height of the object at that time. The time at which the highest point of the trajectory is reached is at D s. (Type an integer or a decimal.) The height of the object at the highest point of the trajectory is D m. [Type an integer or a decimal.)