Anovelty golf ball of mass m is launched with an initial velocity vo (25i-13j) m/s and then follows a parabolic trajectory. at the top of the ball's trajectory, it explodes into two fragments a and b. fragment a has mass ma 1/3 m and is stationary immediately after the explosion, while fragment b has mass mb-2/3 m and has non-zero velocity vb immediately after splitting from fragment a. in answering the following questions, ignore air resistance and assume the terrain over which the ball and fragments fly is level. [taken from 2015 exam (a) how many seconds after the launch does the ball attain its maximum height? (b) what is the velocity v of the ball immediately prior to the explosion? (c) what is the velocity of fragment b immediately before it hits the ground? express your answer in unit vector form